basic openstack support

refs #1589, ensure that vmware public key is automaticilly imported when testing connection

fixes #1463 - let Foreman run on a sub path

e.g. for it being available on http://localhost:3000/foreman you run:

RAILS_RELATIVE_URL_ROOT=/foreman rails s

fixes #1714 allowing users with build permissions to access the submit multiple

fixes #1649 Puppet class and environment import works only on the first smart-proxy

fixes #1544 - Updating a host fails if you cannot reach the SOA nameservers

Since ssh script now runs post commit, we can not update any attributes within the save method

fixes #1667 - restrcutre fog extensions code

[EC2] Adds retry on host not available, add some useful debugging.

- debugging, to get the whole message
- add backtrace to compute resource failure msg
- add debug logging for Fog errors on create

fixes #1597 - Restrict compute resources access by user

And add some rights to give non admin users so they can perform some normal actions on the hosts they own.

unit/domain_parameter_test.rb self-broke... added a tiny fix.
Removing compute_resources/vms nesting, it is such a nightmare for functional tests....