Name is made as mandatory and positional argument in getting started &
manual installation docs.
Also updated the devstack lib.
Change-Id: I5bd87925fc7ee89fdd44f873818d55fdd81611ac
Partial-Bug: #1474966
domain name information should be in VIM configure, which is
different from keystone configuration in tacker.conf.
Also domain name is prefered to domain id.
Change-Id: Iec492e55ff763f92304c129d2373e544269f6271
Partial-bug: #1603851