check all connectors calling config params from user_info

[konstan]

After migration to population of user_info object from CIMI, the names of the attributes (especially cloud ones) have changed. Check this per cloud connector.

• [x] openstack (needed, see https://github.com/slipstream/SlipStreamConnectors/blob/master/openstack/python/tar/slipstream_openstack/OpenStackClientCloud.py#L78)

• [x] cloudstack (may not be needed, see https://github.com/slipstream/SlipStreamConnectors/blob/master/cloudstack/python/tar/slipstream_cloudstack/CloudStackClientCloud.py#L58)

• [x] opennebula (may not be needed, see https://github.com/slipstream/SlipStreamConnectors/blob/master/opennebula/python/tar/slipstream_opennebula/OpenNebulaClientCloud.py#L65)