Replace netty-codec with the actual netty-codec-* dependencies that are required

[lhotari]

Netty 4.2 included this change:

The netty-codec module has been split into a number of different sub-modules, which the netty-codec module then depends on. In other words, netty-codec is now multiple jar files instead of one.

Instead of depending on netty-codec, add dependencies on the libraries that are needed.