Upgrade bazlets to latest stable-3.1 to build with 3.1.5 API
Upgrade bazlets to latest stable-3.1 to build with 3.1.5 API

Change-Id: I840dff24cd11abcfb124d600f45f5e924d936de4

GerritCodeReview/plugins_javamelody,GerritCodeReview/plugins_javamelody,GerritCodeReview/plugins_javamelody