Skip lbaas test test_load_balancer_basic

Skip test_load_balancer_basic since this still isn't fixed. According to
elastic-recheck there have been 515 in the past two weeks with 61 hits
in the last 24 hours.

Change-Id: I41ed4965f489ad666d4c3e481aed4ccd114da6e7
Related-Bug: #129165
Merge branch 'master' of https://github.com/openstack/tempest