Update bazlets to latest revision on stable-2.15
Update bazlets to latest revision on stable-2.15

- Adjust names of prolog dependencies
- Add optional dir_name argument to gerrit_plugin
- gerrit_plugin: Improve stamping error message
- Upgrade Gerrit API to version 2.15.2
- Set Gerrit API snapshot version to 2.15.2-SNAPSHOT
- Fix the error in project properties generation file
- Switch to 2.14.9-SNAPSHOT Gerrit API version for local dev
- Fix deletion of Sonar Scanner folder
- Automate SonarQube analysis for plugins built with bazel
- Use bazel-cache instead of buck-cache
- Use bazel-cache instead of buck-cache
- Update Gerrit API to 2.14.8
- Set Gerrit API snapshot version to 2.14.8-SNAPSHOT

Change-Id: I3a6999700696e71084710a66e7829b0630fa3190

GerritCodeReview/plugins_importer,GerritCodeReview/plugins_importer,GerritCodeReview/plugins_importer,GerritCodeReview/plugins_importer