Add zsh completion for 'docker {build,create,run} --shm-size
Add zsh completion for 'docker {build,create,run} --shm-size

Signed-off-by: Steve Durrheimer <a2c1a055e5b399822be341b4e663de3cd05cf8f7@gmail.com>

aditirajagopal/docker,aditirajagopal/docker,aditirajagopal/docker