BUG-997 Use shared schema context factory in netconf-connector

+ Fix disconnect by netconf-connector. Until now, the connection to remote device was still open even if initialization failed.

Change-Id: I23ee999c7898665498519abf19610deef3d410a3
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>
Merge "BUG-997 Use shared schema context factory in netconf-connector"