Update tests and requirements

Charm-tools and ostestr are not necessary as there are
no unit tests in this repo.  This update allows
the virtualenv to successfully build, and the pep8
test to successfully execute.

Change-Id: If4b64f6c42e58dd3e4b9536a0143434a5f636f1c
Partial-bug: #1729413

test-requirements.txt

@@ -1,3 +1 @@
 flake8>=2.2.4,<=2.4.1
-os-testr>=0.4.1
-charm-tools

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = lint,py27
+envlist = pep8,py27
 skipsdist = True
 
 [testenv]
@@ -15,12 +15,6 @@ deps = -r{toxinidir}/test-requirements.txt
 # TODO: Need to write unit tests then remove the following command.
 commands = /bin/true
 
-[testenv:py34]
-basepython = python3.4
-deps = -r{toxinidir}/test-requirements.txt
-# TODO: Need to write unit tests then remove the following command.
-commands = /bin/true
-
 [testenv:py35]
 basepython = python3.5
 deps = -r{toxinidir}/test-requirements.txt