Making Netconf Via Restconf clustering aware

Making Netconf Via Restconf clustering aware

The Netconf Via Restconf library now got two additional
keywords. One (Create_NVR_Session) allows creating Netconf
Via Restconf sessions pointing to other nodes which are
running ODL and the other one (Activate_NVR_Session)
switches between them. This makes the Netconf Via Restconf
library able to access all nodes within an ODL cluster while
retaining its behavior in the single node case when these
two additional keywords are not used.

Change-Id: Id7fb6c2c11795a59b400dc054ff5d513b89d8631
Signed-off-by: Jozef Behran <jbehran@cisco.com>