Ensure location header urls account for script_name

The API is at /v1... but if is mounted at /gnocchi/v1 then
"/gnocchi" is the script_name and we need to account for that when
generatin URLs for location headers.

Pecan already does this where the application_url attribute is being
used (for generating informational urls in response bodies).

A new gabbi test suite is added which runs all of the existing gabbi
tests with a prefix. Getting this to work identified a bug in gabbi,
thus the update to test-requirements.

Change-Id: I6e3b461610ad1b694e6ae3df33831b3f6224668f

gnocchi/rest/__init__.py

@@ -111,6 +111,7 @@ def enforce(rule, target):
 
 
 def set_resp_location_hdr(location):
+    location = '%s%s' % (pecan.request.script_name, location)
     # NOTE(sileht): according the pep-3333 the headers must be
     # str in py2 and py3 even this is not the same thing in both
     # version

gnocchi/tests/gabbi/test_gabbi_prefix.py

@@ -0,0 +1,34 @@
+#
+# Copyright 2015 Red Hat. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+"""A test module to exercise the Gnocchi API with gabbi."""
+
+import os
+
+from gabbi import driver
+
+from gnocchi.tests.gabbi import fixtures
+
+
+TESTS_DIR = 'gabbits'
+PREFIX = '/gnocchi'
+
+
+def load_tests(loader, tests, pattern):
+    """Provide a TestSuite to the discovery process."""
+    test_dir = os.path.join(os.path.dirname(__file__), TESTS_DIR)
+    return driver.build_tests(test_dir, loader, host=None, prefix=PREFIX,
+                              intercept=fixtures.setup_app,
+                              fixture_module=fixtures)

test-requirements-py3.txt

@@ -1,5 +1,5 @@
 http://tarballs.openstack.org/ceilometer/ceilometer-master.tar.gz#egg=ceilometer
-gabbi>=0.6.0
+gabbi>=0.101.2
 fixtures
 keystonemiddleware>=1.5.0
 mock

test-requirements.txt

@@ -1,5 +1,5 @@
 http://tarballs.openstack.org/ceilometer/ceilometer-master.tar.gz#egg=ceilometer
-gabbi>=0.100.1
+gabbi>=0.101.2
 coverage>=3.6
 fixtures
 keystonemiddleware>=1.5.0