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

This reverts commit 0cc361a9ef982e7190f8aa8375bf8c141d89f4a0.

Change-Id: I3887f7d24d6aa44a4b9cd3ec1eb12fbb422ee5ec
Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>
Applying the Helium.1 release patch

Change-Id: I6f1ad93b193f81ad651238b721ddfe4af491cdfd
Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>