TLS support

TLS is configured in 42-openflowplugin.xml (openflowplugin)
Added tests for:
 - pipeline components
 - TLS classes
 - updated integration test
Added new yang file: openflow-configuration.yang (contains generated classes for library configuration)
Logging updated

Change-Id: I5480b01760377db7de7791594a3b541338a1b43a
Signed-off-by: jameshall03885 <ghall@brocade.com>
Signed-off-by: Michal Polkorab <michal.polkorab@pantheon.sk>