Add travis steps to remove Python 3+ tests

The Redfish tests are Python 3 only. With this change we remove
the tests if running in anything less than Python 3.6.

.travis.yml

@@ -29,6 +29,7 @@ matrix:
     python: "2.7"
     dist: trusty  # trusty required for 2.7
 install:
+  - ./kill_python3_tests.sh
   - pip install -U pip setuptools
   - pip install -Ur requirements-test.txt --upgrade-strategy eager
 script: py.test tests/ -v --cov wrapanapi

kill_python3_tests.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+BLACKLISTED_TEST_FILES=test_redfish.py
+
+PYTHON_VERSION=$(python -c 'import sys ; print("%d%d"%sys.version_info[0:2])')
+
+echo "Python at version $PYTHON_VERSION"
+if (( "$PYTHON_VERSION" < "36" ))
+then
+	echo "Blacklisting files that require at least Python 3.6"
+	for F in $BLACKLISTED_TEST_FILES
+	do
+		echo "tests/$F"
+		[[ -f "tests/$F" ]] && mv "tests/$F" "tests/$F.disable"
+	done
+fi