Preparing for Pike support 2 (neutron_lib context)

Using the neutron context from neutron_lib (but
continues using db_api from neutron instead of
neutron_lib).

Note that Neutron still uses the context from the Neutron
repo in Ocata, so with this patch, both, Neutron and
neutron_lib, contexts will be in play depending on
whether the context is being instantiated by Neutron
or by GBP.

Also updating the tox hacking ignores to not require
translation hints for log messages. This should have been
removed in the previously merged patch which removed the log
message hints.

Change-Id: I8df4d00a8c0109e04e1f72576a54048332666078

gbpservice/common/utils.py

@@ -10,7 +10,10 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from neutron import context as n_ctx
+import sys
+
+from neutron import context as old_context
+from neutron_lib import context as n_context
 from oslo_config import cfg
 from oslo_log import log as logging
 from oslo_utils import importutils
@@ -22,6 +25,29 @@ LOG = logging.getLogger(__name__)
 cfg.CONF.import_group('keystone_authtoken', 'keystonemiddleware.auth_token')
 
 
+def get_current_context():
+    i = 1
+    try:
+        while True:
+            for val in sys._getframe(i).f_locals.itervalues():
+                # REVISIT (Sumit); In Ocata, neutron is still
+                # using the neutron_lib context, hence we need
+                # to check for both. This should be changed in
+                # Pike to only check for the neutron_lib context.
+                if isinstance(val, n_context.Context) or (
+                        isinstance(val, old_context.Context)):
+                    return val
+            i = i + 1
+    except Exception:
+        return
+
+
+def get_current_session():
+    ctx = get_current_context()
+    if ctx:
+        return ctx.session
+
+
 def get_resource_plural(resource):
     if resource.endswith('y'):
         resource_plural = resource.replace('y', 'ies')
@@ -48,7 +74,7 @@ def load_plugin(namespace, plugin):
 
 
 def admin_context(context):
-    admin_context = n_ctx.get_admin_context()
+    admin_context = n_context.get_admin_context()
     admin_context._session = context.session
     return admin_context