Release 0.17.0

[kgeckhart]

Deprecation notice: The comma delimited flags google.project-id and monitoring.metrics-type-prefixes are being replaced by repeatable flags google.project-ids and monitoring.metrics-prefixes. The comma delimited flags will be supported for at least one more release.

• [ENHANCEMENT] Sanitize metric type prefixes to prevent duplicate metrics Sanitize metric type prefixes #319
• [ENHANCEMENT] Add project ID to all logs from the collector Add project IDs to error logs #362
• [FEATURE] Add support for specifying comma-delimited string flags as repeatable flags Replace comma-delimited string flags with repeatable flags #355