[bgpvpn] Extend delete scenarious

* Add bgpvpn delete port association
* Add delete bgpvpn with port association

Related-Prod: PRODX-25126
Change-Id: If5669d805eae70f122c71fa709824285f82b1ee4
(cherry picked from commit 1a1ddd6a52a840716e512788d014ed4c18735b4c)
1 file changed