This removes the duplicate entry of grpc-netty in the Flight pom, which leads
to the following warning:
```
[WARNING] Some problems were encountered while building the effective model for
org.apache.arrow:arrow-flight:jar:0.11.0-SNAPSHOT
[WARNING] 'dependencies.dependency.(groupId:artifactId:type:classifier)' must
be unique: io.grpc:grpc-netty:jar -> duplicate declaration of version
${dep.grpc.version} @ org.apache.arrow:arrow-flight:[unknown-version],
/home/bryan/git/arrow/java/flight/pom.xml, line 55, column 17
```
[ Full content available at: https://github.com/apache/arrow/pull/2679 ]
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