Stale table 21 and table 220 entries

Stale table 21 and table 220 entries

RC: getPrimaryRd() with vpnInstance is used is delete path.
which does not return the correct RD in delete path.

Fix: use getVpnRd() with vpnName  for vpn op data lookup.

The variant with vpnName as lookup key uses vpn-instance-to-vpn-id
DS to read the primary RD which gives correct primary RD value.

Change-Id: I27467be7f0ea5eb6a05e5a5153887f6bbb06bac0
Signed-off-by: Ravindra Thakur <ravindra.nath.thakur@ericsson.com>
Signed-off-by: Arun Sharma <arun.e.sharma@ericsson.com>