[WIP] Add Openstack SSL Support

Allow Openstack connections to be protected with SSL.

Additionally, remove some unused methods in `EmsOpenstack`.

WIP: Looking at how to add tests for this.
Should we be trying SSL first and falling back to trying non-ssl?
Does it make sense to fall back at all or just attempt whatever the "thing" is configured to use ssl/non-ssl and yell and complain if it fails?