BUG-1568 Getting rid of StreamGobller from netconf ssh client.

We have another thread in SshClientAdapter that works as StreamGobller
http://www.ganymed.ethz.ch/ssh2/FAQ.html#blocking

Change-Id: I3f61b14cb22396d8b5898028bd83f62d98c6866d
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>
Merge "BUG-1568 Getting rid of StreamGobller from netconf ssh client."