Add support for Openstack SSL

Allow connections to Openstack to use SSL.

https://bugzilla.redhat.com/show_bug.cgi?id=1089727
https://bugzilla.redhat.com/show_bug.cgi?id=1140693
Remove unneeded connection methods from EmsOpenstack

https://bugzilla.redhat.com/show_bug.cgi?id=1089727
https://bugzilla.redhat.com/show_bug.cgi?id=1140693