lib: Allow bgp to always create a listen socket for the vrf

If tcp_l3mdev_accept = 0, then creating a socket for a vrf
for communication is allowed.  On the other hand if it is =1
then the vrf_socket() code assumes that we have created
a listen socket in the default vrf.  This is a bad assumption
in that it is perfectly valid to create a bgp instance like this:

router bgp 99 vrf BLUE
   <configuration>
!

But not to create a default bgp instance.  As such when BGP
would call the vrf_socket to create the listener for that vrf
the code was dissallowing it.

This code is incorrect behavior.  If we are passing in a interface
to bind the socket to, it is not the correct behavior to just not
bind, especially if the interface passed in is not a vrf name.

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

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