ctdb-recoverd: Short circuit takeover run if no nodes are RUNNING

ctdb-recoverd: Short circuit takeover run if no nodes are RUNNING

If all nodes are still in, say, FIRST_RECOVERY runstate, then the logs
contain unfortunate noise like:

  recoverd:Failed to find node to cover ip 10.0.2.131

This avoids that by adding an early exit that avoids running
takeover_run_core() when there are no nodes in the
CTDB_RUNSTATE_RUNNING.

To support this add the runstate to the ipflags structure.  There are
clearly other ways of hacking this but this seems the simplest.

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>