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.

Rebased: included tests and fixed a problem with the raw_connect method.

Rebased for rubocop
Fair enough.  I definitely didn't like using the same method name.  I didn't think about the statelessness of the method, though.

I'll look at changing this a bit.