Test suite - fix addip test.

Test suite - fix addip test.

The test currently checks that all existing IPs plus the newly added
IP are on the test node after "ctdb addip" is run.  With
DeterministicIPs enabled, if the new IP is "before" other IPs then the
other IPs may be shuffled by the deterministic IPs modulo algorithm.
This will happen on the 1st recovery after the move.  Sometimes this
recovery happens before we get the list of IPs to check and sometimes
after, so the test is racy.

The fix is to simply check for the presence of the new IP and not
worry about the others.  This reduces whatever value this test
had... but you can't have everything.

Signed-off-by: Martin Schwenke <martin@meltin.net>