gate_hook: Stop including localrc

- It isn't necessary (stackrc should be enough)
- It's incompatible with recent gate changes to support local.conf [1]

Also stopped using _list_* methods for tempest tests since they were
removed in tempest.

[1] http://lists.openstack.org/pipermail/openstack-dev/2017-February/112872.html

Closes-Bug: #1667736
Related-Bug: #1667824

Also, the following patch is cherry-picked together to pass the gate.
--------------------------------------
Switch to use test_utils.call_until_true

test.call_until_true has been deprecated since Newton on Tempest side,
and now Tempest provides test_utils.call_until_true as the stable
library method. So this patch switches to use the stable method before
removing old test.call_until_true on Tempest side.

Change-Id: I75d289f27d4e5e02243150dfaca08824d9e5aafa
Needed-by: Ide11a7434a4714e5d2211af1803333535f557370
--------------------------------------

Change-Id: Ib4c9d086bd8c1d5c02be7ba47bdd306f0813659f
(cherry picked from commit 44c3d3d29b)
(cherry picked from commit 9d052fa5f3)
Conflicts:
	neutron_fwaas/tests/tempest_plugin/tests/api/test_fwaas_extensions.py
	neutron_fwaas/tests/tempest_plugin/tests/api/test_fwaasv2_extensions.py
	neutron_fwaas/tests/tempest_plugin/tests/scenario/test_fwaas_v2.py

neutron_fwaas/tests/contrib/gate_hook.sh

@@ -23,7 +23,6 @@ source $TOP_DIR/functions
 source $TOP_DIR/inc/meta-config
 source $TOP_DIR/stackrc
 source $TOP_DIR/lib/database
-source $TOP_DIR/localrc
 
 # Install_databases [install_pg]
 # Tweak the script accordingly if we need psql in future

neutron_fwaas/tests/tempest_plugin/tests/api/test_fwaas_extensions.py

@@ -17,6 +17,7 @@ import six
 from tempest import config
 from tempest import exceptions
 from tempest.lib.common.utils import data_utils
+from tempest.lib.common.utils import test_utils
 from tempest.lib import exceptions as lib_exc
 from tempest import test
 
@@ -99,8 +100,8 @@ class FWaaSExtensionTestJSON(base.BaseFWaaSTest):
             firewall = firewall['firewall']
             return firewall['status'] in target_states
 
-        if not test.call_until_true(_wait, CONF.network.build_timeout,
-                                    CONF.network.build_interval):
+        if not test_utils.call_until_true(_wait, CONF.network.build_timeout,
+                                          CONF.network.build_interval):
             m = ("Timed out waiting for firewall %s to reach %s state(s)" %
                  (fw_id, target_states))
             raise exceptions.TimeoutException(m)

neutron_fwaas/tests/tempest_plugin/tests/api/test_fwaasv2_extensions.py

@@ -18,6 +18,7 @@ import six
 from tempest import config
 from tempest import exceptions
 from tempest.lib.common.utils import data_utils
+from tempest.lib.common.utils import test_utils
 from tempest.lib import exceptions as lib_exc
 from tempest import test
 
@@ -140,8 +141,8 @@ class FWaaSv2ExtensionTestJSON(v2_base.BaseFWaaSTest):
             firewall_group = firewall_group['firewall_group']
             return firewall_group['status'] in target_states
 
-        if not test.call_until_true(_wait, CONF.network.build_timeout,
-                                    CONF.network.build_interval):
+        if not test_utils.call_until_true(_wait, CONF.network.build_timeout,
+                                          CONF.network.build_interval):
             m = ("Timed out waiting for firewall_group %s to reach %s "
                  "state(s)" %
                  (fwg_id, target_states))