* plugins/input/consul: moved check_id from regular fields to tags.
When service has more than one check sending data for both would overwrite each other
resulting only in one check being written (the last one). Adding check_id as a tag
ensures we will get info for all unique checks per service.
* plugins/inputs/consul: updated tests
Leszek Charkiewicz
Daniel Nelson
Sergei Smolianinov
John Engelman
Łukasz Harasimowicz