Rubocops

* EmsRefresh::Parsers::Openstack: favor parentheses for percent literal delimiter
* EmsRefresh::Parsers::Rhevm: clean up hash rockets and delete some commented lines
* VmOpenstack::Operations::Power: remove redundant self
* VmOrTemplate: remove redundant self
* VM specs: ParenthesesAsGroupedExpression
* ExtManagementSystem specs: remove semi colons