Revert "Revert "BUG-2254 Make runtime rpcs in config subsystem/netconf handle context-instance attribute with namespaces""

This reverts commit 63146c45f2c982be3703bf3aae137cbd9498ce76.

Change-Id: Ic5c69846d4418b96c5c1a4036c62e3866f26ac42
Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>
Revert "Revert "BUG-2254 Enable schema-less rpcs invocation in netconf-connector""

This reverts commit 294bfea81a17c03f8ef11f67c7ea9f9277d46d6c.

Change-Id: I6f10689dd79de527c1e78c3a42390cebe3983ad5
Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>