Remove support for py34

The gating on python 3.4 is restricted to <= Mitaka. This is due to
the change from Ubuntu Trusty to Xenial, where only python3.5 is
available. There is no need to continue to keep these settings.

Change-Id: I9701f7ac1551dc60f0f75f64a322a6841108dfe2

doc/source/releasing.rst

@@ -23,7 +23,7 @@ or -2, if you have the right access permissions.
 
 It is also worth noting that every Stadium project will have a periodic job
 running unit tests against the master version of neutron-lib
-(`periodic-neutron-py34-with-neutron-lib-master <http://logs.openstack.org/periodic/periodic-neutron-py34-with-neutron-lib-master/>`_
+(`periodic-neutron-py35-with-neutron-lib-master <http://logs.openstack.org/periodic/periodic-neutron-py35-with-neutron-lib-master/>`_
 being an example). Checking Grafana's `periodic <http://grafana.openstack.org/dashboard/db/neutron-failure-rate?panelId=4&fullscreen>`_
 dashboard can give you a glimpse into the sanity of the integration between
 neutron-lib and the Stadium projects, and can be considered the quick check

setup.cfg

@@ -16,7 +16,6 @@ classifier =
     Programming Language :: Python :: 2
     Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.4
     Programming Language :: Python :: 3.5
 
 [files]

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 2.0
-envlist = py35,py34,py27,pep8
+envlist = py35,py27,pep8
 skipsdist = True
 
 [testenv]