Javadoc 1.8 error fixes
[HORNETQ-1329] Make it possible for an alternative security provider to be specified for the key and trust stores used by NettyConnector and NettyAcceptor.

Amongst other things this makes it possible for a PKCS#11 provider to be specified.
Merge pull request #1545 from scop/javadoc8

Javadoc 1.8 error fixes
Merge pull request #1546 from darranl/HORNETQ-1329/master

[HORNETQ-1329] Make it possible for an alternative security provider to ...
refactor client protocol
abstract session on consumer
abstract session on producer
Session abstraction