- netconf SSH bridge bundle

- Implement bridge using socket
- standard netconf configuration added to netconf-ssh
- NetconfClietnSession no longer needs to propagate channel
- introducet IOThread class for stream copy
- serversession closed when -1 received
- NetconfSSHActivator throws Exception where no valid configuration
  is found
- ganymed bundle fixed to propagate whole package ch.ethz.ssh2.signature
- netconf-ssh bundle added to distribution pom
- netconf ssh server starting in separate thread in order to finis
  activator's start method

Change-Id: I46eac8106a0f222e432d3d8e81c85239ed04ac42
Signed-off-by: Martin Bobak <mbobak@cisco.com>