1. The Gradle apt plugin is no longer needed to process annotations.
2. Without the apt plugin, Gralde puts the source files generated by
annotation processors in build/generated/sources/annotationProcessor.
3. Change the location of custom generated files to be consistent.
4. Fix a javadoc formatting error.
* Fix dependency-locking config
Reenable dependency locking after a bug errorneouly turned it off.
Removed the guava-related workaround that forcefully resolve to
the -jre distribution.
Enabled locking for buildSrc by updating its property file.
Updated all lock files.