[METRICS-383] write_tsdb plugin
Uncrustify write_tsdb
[METRICS-383] Add HostTags which adds tags for all metrics from this writer
[METRICS-390] Add tag writing from metadata using TSDB target_set patches
[METRICS-390] Fix string handling for TSDB prefix and tags
[METRICS-390] Make sure HostTags is initialized if not configured
[METRICS-383] Add Brett Hawn and Kevin Bowling to AUTHORS
[METRICS-383] Default to counters, not rates. Remove unused config code.
[METRICS-383] Add documentation for write_tsdb
[METRICS-383] Review fixes for octo
Merge remote-tracking branch 'github/pr/703'