Add extras and pytz>=2013.6 into test requirements

These two modules are seemingly installed in ubuntu 16 and Fedora
systems. Ubuntu 14 needs them to be included explicitly.

Change-Id: I3e56453c36be20b160ba61a26015ec8ed0fa02a4
Closes-bug: 1623308

test-requirements.txt

@@ -5,6 +5,7 @@ bandit>=1.1.0 # Apache-2.0
 bashate>=0.2 # Apache-2.0
 beautifulsoup4 # MIT
 doc8 # Apache-2.0
+extras # MIT
 hacking>=0.10.0
 oslo.log>=1.14.0 # Apache-2.0
 oslotest>=1.10.0 # Apache-2.0
@@ -21,6 +22,7 @@ python-keystoneclient!=2.1.0,>=2.0.0 # Apache-2.0
 python-neutronclient>=5.1.0 # Apache-2.0
 python-novaclient!=2.33.0,>=2.29.0 # Apache-2.0
 python-swiftclient>=2.2.0 # Apache-2.0
+pytz>=2013.6 # MIT
 sphinx!=1.3b1,<1.3,>=1.2.1 # BSD
 testrepository>=0.0.18 # Apache-2.0/BSD
 testscenarios>=0.4 # Apache-2.0/BSD