cli: add username/password prompt (phase 2) #854338

this patch disallowing specifying password via bash
commandline.

Change-Id: Ie6aa6e7b2c2c1802e0afc4a067a5357ab518c2f0
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=854338
Signed-off-by: Michael pasternak <mpastern@redhat.com>