ospfd: prevent passive interface cmd crash

ospfd: prevent passive interface cmd crash

Current OSPF VRF configuration are allow pre-provisining even if
VRF is not configured. In such case ospf->vrf_id would VRF_UNKNOWN,
when passive interface configuration done under such ospf instance,
it would lookup all vrf_device and try to create ifp with unknown
vrf_id.

for passive interface config command lookup ifp for vrf_id is within range.

Ticket:CM-19156
Testing Done:
Configure
Cumulus#: router ospf vrf vrf1
Cumulus(config-router)#: passive interface swp16
 interface swp16 not found.

Signed-off-by: Chirag Shah <chirag@cumulusnetworks.com>