Imports of docker command

PathSynopsis
flagPackage flag implements command-line flag parsing.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/dotcloud/docker
github.com/dotcloud/docker/engine
github.com/dotcloud/docker/sysinit
github.com/dotcloud/docker/utils
logPackage log implements a simple logging package.
osPackage os provides a platform-independent interface to operating system functionality.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.