Fix 'tox -e releasenotes' startup

Change-Id: Ibca5d700371f3d649c3656d2e85a773ae7751d08

doc/requirements.txt

@@ -4,3 +4,4 @@
 oslo.config>=5.2.0 # Apache-2.0
 openstackdocstheme>=1.18.1 # Apache-2.0
 sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
+reno>=2.7.0 # Apache-2.0

releasenotes/source/conf.py

@@ -11,10 +11,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
-import sys
 
-sys.path.insert(0, os.path.abspath('../..'))
 # -- General configuration ----------------------------------------------------
 
 # Add any Sphinx extension module names here, as strings. They can be

tox.ini

@@ -63,6 +63,10 @@ local-check-factory = vitrage.hacking.checks.factory
 import_exceptions = vitrage.i18n
 
 [testenv:releasenotes]
+deps =
+  -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
+  -r{toxinidir}/requirements.txt
+  -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:lower-constraints]