Test suite: wait_until_node_has_status() now uses "onnode any".

Test suite: wait_until_node_has_status() now uses "onnode any".

Many tests currently do this sort of thing:

  onnode 0 $CTDB_TEST_WRAPPER wait_until_node_has_status 1 disconnected

In fact, they all use exactly the same "onnode 0 $CTDB_TEST_WRAPPER"
idiom.  This is both repetitious and dangerous, since node 0 might be
shutdown during a test.  Instead, we push "onnode any
$CTDB_TEST_WRAPPER" (which selects a connected node) into
wait_until_node_has_status() and just call that function directly in
tests, like this:

  wait_until_node_has_status 1 disconnected

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