Docker v1.11.0-rc3 发布

Docker v1.11.0-rc3 发布了。此次改进记录如下：

Fix a bug where Docker would not used the correct uid/gid when processing the WORKDIR command (#21033)
Fix a bug where copy operations with userns would not use the proper uid/gid (#20782,#21162)

Usage of the : separator for security option has been deprecated. = should be used instead (#21232)
The client user agent is now passed to the registry on pull, build, push, login andsearch operations (#21306, #21373)
Allow setting the Domainname and Hostname separately through the API (#20200)
Docker info will now warn users if it can not detect the kernel version or the operating system (#21128)
Fix an issue where docker stats --no-stream output could be all 0s (#20803)
Fix a bug where some newly started container would not appear in a running docker statscommand (#20792)
Post processing is no longer enabled for linux-cgo terminals (#20587)
Values to --hostname are now refused if they do not comply with RFC1123 (#20566)
Docker learned how to use a SOCKS proxy (#20366, #18373)
Docker now supports external credential stores (#20107)
docker ps now supports displaying the list of volumes mounted inside a container (#20017)
docker info now also report Docker’s root directory location (#19986)
Docker now prohibits login in with an empty username (spaces are trimmed) (#19806)
Docker events attributes are now sorted by key (#19761)
docker ps no longer show exported port for stopped containers (#19483)
Docker now cleans after itself if a save/export command fails (#17849)
Docker load learned how to display a progress bar (#17329, #120078)