Change to tread docker damaen the same as other commands not just an option.

Remove the -d options and add a daemon command.
This makes the handling of options the same for all use cases.  Eliminates
unexpected results when users add options to the command line that do not do anything.

Docker-DCO-1.1-Signed-off-by: Dan Walsh <dwalsh@redhat.com> (github: rhatdan)