Multiple fixes in different module

Multiple fixes in different module

This commit includes following changes and bug fixes:

  - Additional check when handling operational ds of vpn interface
  - Performance Issue: Association/Dissociation of router takes
    huge time.
  - All Internal VPN(ROUTER) Ip's not coming on deletion of L3VPN
  - NextHop for SubnetRoute not re-programmed in DCGW after a DPN
    disconnect.
  - NextHop for Subnet route not re-programmed on DC-GW.
  - Some of VM entries and Invisible IPs of VM are not in FIB
  - Fixed disassociate of floating ip
  - New Invisible IP is not reachable from
    DC/DC-GW after reboot

Change-Id: I3b0e6cc1fc9f8396d93b5391efaaefcac4b8eabd
Signed-off-by: Suraj Ranjan <suraj.ranjan@ericsson.com>
Signed-off-by: Sam Hague <shague@redhat.com>