Locking down redis version to 2.10.5

Updating requirements.txt to prevent issues with LuaLock caused by new redis client version

Author: balajeerc

requirements-base.txt

@@ -1,5 +1,5 @@
 argparse>=1.1
-redis>=2.10.5
+redis==2.10.5
 pymongo>=3.0.1
 gevent>=1.2.2
 ujson>=1.33