Remove duplicated methods from container.py
Remove duplicated methods from container.py

Signed-off-by: Aanand Prasad <94fc4f3e3d0be608b3ed7b8529ff28d2a445cce1@gmail.com>

minzhang28/docker-py,youhong316/docker-py,vdemeester/docker-py,funkyfuture/docker-py,vdemeester/docker-py,auready/docker-py,docker/docker-py,docker/docker-py,vpetersson/docker-py,dimaspivak/docker-py,bfirsh/docker-py,dimaspivak/docker-py,youhong316/docker-py,funkyfuture/docker-py,kaiyou/docker-py,minzhang28/docker-py,auready/docker-py,vpetersson/docker-py,kaiyou/docker-py,bfirsh/docker-py