Openstack cloud network, security group, floating IP filtering based on selected tenant

https://bugzilla.redhat.com/show_bug.cgi?id=1142487

Filter configuration items based on selected tenant, if the tenant is not selected it uses the provider to list all the configuration items.
@mkanoor I am hoping we can come up with a better name for this method.  Thinking something more descriptive like ```provider_or_tenant_object``` but I am open for suggestions here.