CentOS/RHEL8 have abandoned the bridge-utils package so the brctl
cmd is none avalible, and on Ubuntu 18.04 and 20.04 the nmcli is
buggy to setup the bridge. So this will fall back to use ip cmd
to setup the bridge stuff.
Fixes: https://tracker.ceph.com/issues/45459
Signed-off-by: Xiubo Li <xiubli@redhat.com>