The tests can now wait for a number of monitor intervals. This removes the
need to have hard-coded sleeps in the code and makes monitor tests more
robust under heavier load.
Increased the amount of time that the tests sleep while they wait for
states to change. This should make them more tolerant of server load by
allowing more time for things to settle down.
The test checks that failover works even when the master of the monitored
cluster is a slave to an external masters. The test also verifies that the
servers do not get unexpected status labels.
