Revert "Bump jetty version to 9.4.20.v20190813"
Revert "Bump jetty version to 9.4.20.v20190813"

This reverts commit 6677a6e19f8d7d45e0ee375f4622386599d761aa.

Reason for revert: Not matching internal version

Change-Id: I08128db46984b3b68b2b613cff379542dde6e6af

GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit