Add CERT file support in heat-keystone-setup-domain

Add below options to support ssl connection.
--insecure
--os-cacert
--os-cert
--os-key

Change-Id: I9d1fd07df783d7410ac3f51b5d4e8434d57182a4
Close-bug: #1387063
(cherry picked from commit 8d4e7acb83add56b2105b9da2b5d263cec1d7cdd)