Demote logging of shaded files to debug

Output from a recent failing build where I was looking for a test failure:

```
[INFO] Including com.facebook.presto:presto-benchmark-driver:jar:0.289-SNAPSHOT in the shaded jar.
[INFO] Including com.facebook.presto.scribe:presto-scribe-client:jar:1.16 in the shaded jar.
[INFO] Including com.facebook.drift:drift-api:jar:1.38 in the shaded jar.
[INFO] Including com.facebook.airlift:concurrent:jar:0.209 in the shaded jar.
[INFO] Including com.facebook.airlift:configuration:jar:0.209 in the shaded jar.
[INFO] Including cglib:cglib-nodep:jar:3.2.5 in the shaded jar.
[INFO] Including com.facebook.airlift:stats:jar:0.209 in the shaded jar.
[INFO] Including org.hdrhistogram:HdrHistogram:jar:2.1.9 in the shaded jar.
[INFO] Including io.airlift:slice:jar:0.38 in the shaded jar.
[INFO] Including org.openjdk.jol:jol-core:jar:0.2 in the shaded jar.
[INFO] Including com.facebook.airlift:event:jar:0.209 in the shaded jar.
[INFO] Including com.facebook.airlift:node:jar:0.209 in the shaded jar.
[INFO] Including com.facebook.airlift:http-client:jar:0.209 in the shaded jar.
[INFO] Including ch.qos.logback:logback-core:jar:1.2.3 in the shaded jar.
[INFO] Including org.eclipse.jetty:jetty-client:jar:9.4.14.v20181114 in the shaded jar.
[INFO] Including org.eclipse.jetty:jetty-io:jar:9.4.14.v20181114 in the shaded jar.
[INFO] Including org.eclipse.jetty:jetty-util:jar:9.4.14.v20181114 in the shaded jar.
[INFO] Including org.eclipse.jetty:jetty-http:jar:9.4.14.v20181114 in the shaded jar.
[INFO] Including org.eclipse.jetty.http2:http2-client:jar:9.4.14.v20181114 in the shaded jar.
[INFO] Including org.eclipse.jetty.http2:http2-common:jar:9.4.14.v20181114 in the shaded jar.
[INFO] Including org.eclipse.jetty.http2:http2-hpack:jar:9.4.14.v20181114 in the shaded jar.
[INFO] Including org.eclipse.jetty:jetty-alpn-client:jar:9.4.14.v20181114 in the shaded jar.
[INFO] Including org.eclipse.jetty.http2:http2-http-client-transport:jar:9.4.14.v20181114 in the shaded jar.
[INFO] Including org.eclipse.jetty:jetty-alpn-java-client:jar:9.4.14.v20181114 in the shaded jar.
[INFO] Including com.facebook.airlift:http-utils:jar:0.209 in the shaded jar.
[INFO] Including com.facebook.airlift:trace-token:jar:0.209 in the shaded jar.
[INFO] Including net.jodah:failsafe:jar:2.0.1 in the shaded jar.
[INFO] Including com.facebook.airlift:discovery:jar:0.209 in the shaded jar.
[INFO] Including com.fasterxml.jackson.core:jackson-core:jar:2.11.0 in the shaded jar.
[INFO] Including com.facebook.airlift:json:jar:0.209 in the shaded jar.
[INFO] Including com.fasterxml.jackson.datatype:jackson-datatype-jdk8:jar:2.11.0 in the shaded jar.
[INFO] Including com.fasterxml.jackson.datatype:jackson-datatype-jsr310:jar:2.11.0 in the shaded jar.
[INFO] Including com.fasterxml.jackson.datatype:jackson-datatype-guava:jar:2.11.0 in the shaded jar.
[INFO] Including com.fasterxml.jackson.datatype:jackson-datatype-joda:jar:2.11.0 in the shaded jar.
[INFO] Including com.fasterxml.jackson.module:jackson-module-parameter-names:jar:2.11.0 in the shaded jar.
[INFO] Including com.fasterxml.jackson.dataformat:jackson-dataformat-smile:jar:2.11.0 in the shaded jar.
[INFO] Including com.facebook.airlift:log:jar:0.209 in the shaded jar.
[INFO] Including io.airlift:units:jar:1.3 in the shaded jar.
[INFO] Including org.weakref:jmxutils:jar:1.19 in the shaded jar.
[INFO] Including com.google.inject:guice:jar:4.2.2 in the shaded jar.
[INFO] Including aopalliance:aopalliance:jar:1.0 in the shaded jar.
[INFO] Including javax.inject:javax.inject:jar:1 in the shaded jar.
[INFO] Including javax.annotation:javax.annotation-api:jar:1.3.2 in the shaded jar.
[INFO] Including javax.validation:validation-api:jar:2.0.1.Final in the shaded jar.
[INFO] Including joda-time:joda-time:jar:2.12.7 in the shaded jar.
[INFO] Including com.fasterxml.jackson.core:jackson-annotations:jar:2.11.0 in the shaded jar.
[INFO] Including com.fasterxml.jackson.core:jackson-databind:jar:2.11.0 in the shaded jar.
[INFO] Including com.facebook.drift:drift-codec:jar:1.38 in the shaded jar.
[INFO] Including com.facebook.drift:drift-protocol:jar:1.38 in the shaded jar.
[INFO] Including io.airlift:parameternames:jar:1.3 in the shaded jar.
[INFO] Including com.facebook.airlift:bytecode:jar:1.3 in the shaded jar.
[INFO] Including org.ow2.asm:asm:jar:9.0 in the shaded jar.
[INFO] Including org.ow2.asm:asm-tree:jar:9.0 in the shaded jar.
[INFO] Including org.ow2.asm:asm-util:jar:9.0 in the shaded jar.
[INFO] Including org.ow2.asm:asm-analysis:jar:9.0 in the shaded jar.
[INFO] Including com.facebook.drift:drift-client:jar:1.38 in the shaded jar.
[INFO] Including com.facebook.drift:drift-transport-spi:jar:1.38 in the shaded jar.
[INFO] Including com.facebook.drift:drift-transport-netty:jar:1.38 in the shaded jar.
[INFO] Including com.facebook.airlift:security:jar:0.209 in the shaded jar.
[INFO] Including io.netty:netty-common:jar:4.1.107.Final in the shaded jar.
[INFO] Including io.netty:netty-buffer:jar:4.1.107.Final in the shaded jar.
[INFO] Including io.netty:netty-handler-proxy:jar:4.1.107.Final in the shaded jar.
[INFO] Including io.netty:netty-codec-socks:jar:4.1.107.Final in the shaded jar.
[INFO] Including io.netty:netty-codec-http:jar:4.1.107.Final in the shaded jar.
[INFO] Including io.netty:netty-handler:jar:4.1.107.Final in the shaded jar.
[INFO] Including io.netty:netty-resolver:jar:4.1.107.Final in the shaded jar.
[INFO] Including io.netty:netty-transport-native-unix-common:jar:4.1.107.Final in the shaded jar.
[INFO] Including io.netty:netty-transport-classes-epoll:jar:4.1.107.Final in the shaded jar.
[INFO] Including io.netty:netty-transport-native-epoll:jar:linux-x86_64:4.1.107.Final in the shaded jar.
[INFO] Including io.netty:netty-transport:jar:4.1.107.Final in the shaded jar.
[INFO] Including io.netty:netty-codec:jar:4.1.107.Final in the shaded jar.
[INFO] Including com.google.guava:guava:jar:26.0-jre in the shaded jar.
[INFO] Including com.google.code.findbugs:jsr305:jar:3.0.2 in the shaded jar.
[INFO] Including org.checkerframework:checker-qual:jar:2.5.2 in the shaded jar.
[INFO] Including com.google.errorprone:error_prone_annotations:jar:2.1.3 in the shaded jar.
[INFO] Including com.google.j2objc:j2objc-annotations:jar:1.1 in the shaded jar.
[INFO] Including org.codehaus.mojo:animal-sniffer-annotations:jar:1.14 in the shaded jar.
[INFO] Including org.apache.bval:bval-jsr:jar:2.0.0 in the shaded jar.
```

How much of that was relevant?

None.

This log output is rarely if ever helpful or needed. Get rid of it.