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: Ib94f0f269173072b5a4c77d46b43852e78092487

TESTING.rst

@@ -68,7 +68,7 @@ environments for running test cases. It uses `Testr`_ for managing the running
 of the test cases.
 
 Tox handles the creation of a series of `virtualenvs`_ that target specific
-versions of Python (2.7, 3.4, etc).
+versions of Python (2.7, 3.5, etc).
 
 Testr handles the parallel execution of series of test cases as well as
 the tracking of long-running tests and other things.

setup.cfg

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

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py35,py34,py27,pep8,docs
+envlist = py35,py27,pep8,docs
 minversion = 1.6
 skipsdist = True
 
@@ -38,8 +38,8 @@ commands = oslo_debug_helper {posargs}
 basepython = python2.7
 commands = oslo_debug_helper {posargs}
 
-[testenv:debug-py34]
-basepython = python3.4
+[testenv:debug-py35]
+basepython = python3.5
 commands = oslo_debug_helper {posargs}
 
 [testenv:pep8]