Upgrade bazlets to latest stable-2.16 to build with 2.16.21 API
Upgrade bazlets to latest stable-2.16 to build with 2.16.21 API

Change-Id: Iec980abc159128fab593ae50df8031ecf9125b85

GerritCodeReview/plugins_javamelody,GerritCodeReview/plugins_javamelody,GerritCodeReview/plugins_javamelody