Revert "API-289. Update metrics-core version"
Revert "API-289. Update metrics-core version"

This reverts commit 5f451d1b4fffd0492247203323e8a3968dca6f8f.

Reason for revert: This change broke everything (linkage errors in Control Hub)

Change-Id: Ia31be4c09a84afa11f85c953968cebb5ee57ab42
Reviewed-on: https://review.streamsets.net/c/19426
Reviewed-by: Jeff Evans <f3e731dfa293c7a83119d8aacfa41b5d2d780be9@streamsets.com>

streamsets/datacollector-api,streamsets/datacollector-api