Add user-stage command
This patch replaces 'stageuser-add --from-delete' with new command
user-stage.
Original way always required to specify first and last name, and
overall combination of options was hard to manage. The new command
requires only login of deleted user (user-del --preserve).
https://fedorahosted.org/freeipa/ticket/5041
Reviewed-By: Thierry Bordaz <tbordaz@redhat.com>
Reviewed-By: Jan Cholasta <jcholast@redhat.com>