BUG-634: introduce netty ChannelFactory wrapper

Adds a wrapper for services exposing ChannelFactory. Needed for
protocols which need to extended netty functionality.

Change-Id: I8b29e3a91380519f03e5a2c5299077876d1c9edf
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge "BUG-634: introduce netty ChannelFactory wrapper"