Medium: mysql: only check slave status if OCF_CHECK_LEVEL>0
Medium: mysql: only check slave status if OCF_CHECK_LEVEL>0

check_slave requires test_user to be set. Since the previous
assumption was that test_user needed to be set only if
$OCF_CHECK_LEVEL was greater than zero, follow that precedent
for check_slave too.

stevenraspudic/resource-agents,asp24/resource-agents,stevenraspudic/resource-agents,stevenraspudic/resource-agents,asp24/resource-agents,asp24/resource-agents