Added py35 environment configuration to tox.ini

Change-Id: I5b469d4dfbc00f2939dae952dc5d0a0163f71359

tox.ini

@@ -57,6 +57,17 @@ commands =
     rm -f .coverage
     rm -rf .testrepository
 
+[testenv:py35]
+basepython = python3.5
+setenv =
+  OS_TEST_PATH = ./freezer/tests/unit
+commands =
+    find . -type f -name "*.pyc" -delete
+    python setup.py testr --coverage --testr-args="{posargs}"
+    coverage report -m
+    rm -f .coverage
+    rm -rf .testrepository
+
 [testenv:docs]
 commands =
   python setup.py build_sphinx