Don't bundle all netty dependencies into netty-all (#11202)
Don't bundle all netty dependencies into netty-all (#11202)

Motivation:

netty-all already depends on the other netty-* packages so there's no need to also bundle them.

The duplicated classes cause classpath issues, particularly with Java > 8, which reports errors like this:
The package io.netty.buffer is accessible from more than one module: io.netty.all, io.netty.buffer

Modifications:

- Removed bundling tasks from netty-all's maven pom.xml

Result:

- netty-all no longer bundles all classes. Instead, classes are provided by expressed dependencies.

Fixes #4671
NiteshKant/netty,netty/netty,Spikhalskiy/netty,doom369/netty,johnou/netty,NiteshKant/netty,johnou/netty,NiteshKant/netty,doom369/netty,tbrooks8/netty,NiteshKant/netty,doom369/netty,netty/netty,tbrooks8/netty,johnou/netty,tbrooks8/netty,Spikhalskiy/netty,tbrooks8/netty,doom369/netty,netty/netty,Spikhalskiy/netty,netty/netty,Spikhalskiy/netty,doom369/netty,tbrooks8/netty,netty/netty,johnou/netty,Spikhalskiy/netty,johnou/netty,NiteshKant/netty