try and add some consistency with the show and delete commands.
replace 'show x' with 'display x'
change 'delete a y' with just 'delete y'
Change-Id: I47dfa8ee23ac5c41b355796415eb515155832f65
Change the implementation of --enable|--disable on domain create
and set commands to our usual style.
Change-Id: I10f2b96281a114fa3cf3b001394844770b2a8632