invoke redis in a way that works on centos and ubuntu

awx/main/tests/base.py

@@ -59,7 +59,7 @@ class QueueTestMixin(object):
             # Centos 6.5 redis is runnable by non-root user but is not in a normal users path by default
             env = dict(os.environ)
             env['PATH'] = '%s:/usr/sbin/' % env['PATH']
-            self.redis_process = Popen('redis-server --port 16379 > /dev/null',
+            self.redis_process = Popen('echo "port 16379" | redis-server - > /dev/null',
                                        shell=True, executable='/bin/bash',
                                        env=env)