Added a cli command for user_delete
Added a cli command for user_delete

Did some light interactive testing, but need to figure out how to write
unit tests for the cli.

henn/hil,meng-sun/hil,lokI8/haas,henn/hil_sahil,henn/haas,CCI-MOC/haas,SahilTikale/switchHaaS,SahilTikale/haas,apoorvemohan/haas,henn/hil_sahil,apoorvemohan/haas,kylehogan/hil,kylehogan/hil,meng-sun/hil,henn/hil,kylehogan/haas