Upgrade bazlets to latest stable-2.15
Upgrade bazlets to latest stable-2.15

Includes further fixes for --incompatible_disallow_legacy_java_provider.

Change-Id: I089fec1e5d685feb53004dfc77b4a15ff8041cdf

GerritCodeReview/plugins_admin-console,GerritCodeReview/plugins_admin-console,GerritCodeReview/plugins_admin-console