test,qa/workunits: add tests for public_bind_addr

test,qa/workunits: add tests for public_bind_addr

Add a set of new tests for the case when public_addr and public_bind_addr
are different for a mon. In order to test this properly I had to employ
port forwarding with socat. This helps simulate what would happen in a
environment like Kubernetes. socat is now a build dependency.

Also, moved jq_success to ceph-helpers.sh and refactored run_mon to enable
creating the mons without creating the rbd pool immediately.

Signed-off-by: Bassam Tabbara <bassam.tabbara@quantum.com>