* get glance api servers list from one entry point for http(s)
* set the following descending priority for getter:
- hiera glance_api_servers raw list
- get_ssl_property() return
- hiera glance_endpoint ip address
- $management_vip
Change-Id: I80c45d1c6cdabfd8aa239ae61d8c4add5e9e8cbe
Closes-Bug: #1568088
Closes-bug: #1569443