Allow binding on lo

Allow binding on lo

Forwarded: https://github.com/ceph/ceph/pull/38925
Last-Update: 2021-01-15

Commmit 5cf0fa8, solves the issue that
the osd can't restart after seting a virtual local loopback IP. However,
this commit also prevents a bgp-to-the-host over unumbered Ipv6
local-link is setup, where OSD typically are bound to the lo interface.

To solve this, this single char patch simply checks against "lo:" to
match only virtual interfaces instead of anything that starts with "lo".

Gbp-Pq: Name allow-binding-on-lo.patch