Disable loadbalancers tests on pike

Fix disables two tests:
 * test_create_update_loadbalancer
 * test_add_delete_poolmember

Because this config when LBaasv2 and Octavia both
are enabled is not valid

Change-Id: Id54fd4c59280c00480788a9a4865772ea280717a
Related-PROD: PROD-24171
1 file changed