ctdb-tests: Don't retrieve the VNN map from target node for notlmaster

ctdb-tests: Don't retrieve the VNN map from target node for notlmaster

Use the VNN map from the node running node_has_status().

This means that

  wait_until_node_has_status 1 notlmaster 10 0

will run "ctdb status" on node 0 and check (for up to 10 seconds) if
node 1 is in the VNN map.

If the LMASTER capability has been dropped on node 1 then the above
will wait for the VNN map to be updated on node 0.  This will happen
as part of the recovery that is triggered by the change of LMASTER
capability.  The next command will then only be able to attach to
$TESTDB after the recovery is complete thus guaranteeing a sane state
for the test to continue.

This stops simple/79_volatile_db_traverse.sh from going into recovery
during the traverse or at some other inconvenient time.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14085

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