* stackdriver: add resource type to filter and group bys
* stackdriver: remove not used param
* stackdriver: refactor filter and group by code
* stackdriver: remove resource type if its already in filter list
* stackdriver: remove debug logging
* stackdriver: remove more debug logging
* stackdriver: append resource type to legend name if there are more than one type present in the response
* stackdriver: only make new request if filter has real value
* stackdriver: format legend support for resource type
* stackdriver: add resource type to documentation
* stackdriver: not returning promise from query function
* stackdriver: fix refactoring bug
* stackdriver: remove not used import