Added tox target which checks requirements.txt

New tox target check that there is no missing or superfluous (unused)
requirements in requirements.txt.

Patch is copy/paste from Iff37af95269c38e4d435a53a21e5d60e2c5a3fa8
which do the same for Tempest projec.

This change also includes the fixes to requirements.txt needed
to pass the new tests.

Change-Id: Id52c5b140647268525120373ac19a63f72b12462

doc/source/refstack.rst

@@ -68,6 +68,16 @@ Clone the repository
 
 ``pip install -U pip``
 
+**Install environment pre-requirements**
+
+# App server
+
+``pip install gunicorn==18``
+
+# python mysql connector
+
+``pip install PyMySQL>=0.6.2,!=0.6.4``
+
 Install RefStack application
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 

requirements.txt

@@ -2,15 +2,14 @@ SQLAlchemy>=0.8.3
 alembic==0.5.0
 beaker==1.6.5.post1
 cryptography>=1.0,!=1.3.0 # BSD/Apache-2.0
-#gunicorn 19.1.1 has a bug with threading module
-gunicorn==18
 oslo.config>=1.6.0 # Apache-2.0
 oslo.db>=1.4.1 # Apache-2.0
-oslo.log
+oslo.log>=3.11.0
+oslo.utils>=3.16.0 # Apache-2.0
+six>=1.9.0 # MIT
 pecan>=0.8.2
-pyOpenSSL>=0.14
 requests>=2.2.0,!=2.4.0
 requests-cache>=0.4.9
 jsonschema>=2.0.0,<3.0.0
-PyMySQL>=0.6.2,!=0.6.4
-PyJWT>=1.0.1  # MIT
+PyJWT>=1.0.1  # MIT
+WebOb>=1.6.0  # MIT

test-requirements.txt

@@ -10,5 +10,5 @@ oslotest>=1.2.0 # Apache-2.0
 python-subunit>=0.0.18
 testrepository>=0.0.18
 testtools>=0.9.34
-six>=1.7.0
 pep257>=0.5.0
+PyMySQL>=0.6.2,!=0.6.4

tox.ini

@@ -2,7 +2,7 @@
 # py34 tests should be run before py27
 # it is a workaround for testr bug
 # https://bugs.launchpad.net/testrepository/+bug/1229445
-envlist = py34,py27,pep8
+envlist = py34,py27,pep8,pip-check-reqs
 minversion = 1.6
 skipsdist = True
 
@@ -59,3 +59,14 @@ ignore = E125,H404
 show-source = true
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,tools,build
+
+[testenv:pip-check-reqs]
+# Do not install test-requirements as that will pollute the virtualenv for
+# determining missing packages.
+# This also means that pip-check-reqs must be installed separately, outside
+# of the requirements.txt files
+deps = pip_check_reqs
+       -r{toxinidir}/requirements.txt
+commands=
+    pip-extra-reqs -d --ignore-file=refstack/tests/* refstack
+    pip-missing-reqs -d --ignore-file=refstack/tests/* refstack