Fix for populating datastore properly

Fix for populating datastore properly

While updating used RDs, deletion of
extra-route was being performed on wrong
datastore, fixing this one by using operational
vpn interface op data.

Maintaining different transaction for config
extraroute-rds-map datastore.

Removing redundant delete of extra-route
from delAdjFromVpnInterface method since
it is already being taken care by remove
and update of FIB.

Change-Id: I04c4057501abb3c4010361c18da9688379fa70d4
Signed-off-by: eswanit <swati.udhavrao.niture@ericsson.com>