Add python-memcached to test-requirements

More unit tests run when python-memcached is installed, so add it to
test-requirements.txt.

python-memcached doesn't work on py3k so it can't be in the test
requirements for the python3 jobs.

Closes-Bug: #1411003
Change-Id: I08036c7665421987da9dfd19f6f1e18dc5918f96

test-requirements-py3.txt

@@ -0,0 +1,18 @@
+# The order of packages is significant, because pip processes them in the order
+# of appearance. Changing the order has an impact on the overall integration
+# process, which may cause wedges in the gate later.
+
+coverage>=3.6
+discover
+fixtures>=0.3.14
+hacking>=0.8.0,<0.9
+mock>=1.0
+pycrypto>=2.6
+oslosphinx>=2.2.0  # Apache-2.0
+oslotest>=1.2.0  # Apache-2.0
+oslo.messaging>=1.4.0,!=1.5.0
+requests-mock>=0.5.1  # Apache-2.0
+sphinx>=1.1.2,!=1.2.0,!=1.3b1,<1.3
+testrepository>=0.0.18
+testresources>=0.2.4
+testtools>=0.9.36,!=1.2.0

test-requirements.txt

@@ -16,3 +16,4 @@ sphinx>=1.1.2,!=1.2.0,!=1.3b1,<1.3
 testrepository>=0.0.18
 testresources>=0.2.4
 testtools>=0.9.36,!=1.2.0
+python-memcached>=1.48

tox.ini

@@ -14,6 +14,14 @@ deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands = python setup.py testr --testr-args='{posargs}'
 
+[testenv:py33]
+deps = -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements-py3.txt
+
+[testenv:py34]
+deps = -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements-py3.txt
+
 [testenv:pep8]
 commands =
   flake8