*: Remove some unneeded functions

*: Remove some unneeded functions

vrf_iflist_create -> By the time this is called in enable, the vrf's iflist
is already created.  Additionally this code should be a properly of the vrf
to init/destroy not someone else.

vrf_iflist_terminate -> This function should be a property of vrf deletion
and does not need to be exposed.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>