Docker v1.11.2 发布

Docker v1.11.2 发布了，更新如下：

Fix a stale endpoint issue on overlay networks during ungraceful restart (#23015)
Fix an issue where the wrong port could be reported by docker inspect/ps/port (#22997)

Fix a potential panic when running docker build (#23032)
Fix interpretation of --user parameter (#22998)
Fix a bug preventing container statistics to be correctly reported (#22955)
Fix an issue preventing container to be restarted after daemon restart (#22947)
Fix issues when running 32 bit binaries on Ubuntu 16.04 (#22922)
Fix a possible deadlock on image deletion and container attach (#22918)
Fix an issue where containers fail to start after a daemon restart if they depend on a containerized cluster store (#22561)
Fix an issue causing docker ps to hang on CentOS when using devicemapper (#22168, #23067)
Fix a bug preventing to docker exec into a container when using devicemapper (#22168, #23067)