rename image from dockerfile/redis to redis
rename image from dockerfile/redis to redis

rvenugopal/container-vm-guestbook-redis-python,GoogleCloudPlatform/container-vm-guestbook-redis-python,GoogleCloudPlatform/container-vm-guestbook-redis-python,GoogleCloudPlatform/container-vm-guestbook-redis-python,rvenugopal/container-vm-guestbook-redis-python,rvenugopal/container-vm-guestbook-redis-python