* Make PublishPlugin gradle configuration cache compliant
for using --configuration-cache we need to remove some usages of the mutable project instance
* Polishing
just configuring common conventions on java based projects without
adding opinionated sourcesets. Reduces the configuration overhead for
yaml rest test only projects.
In the end we create less tasks and configure less for test only projects.
This moves the public build api and plugins into a separete included build called 'build-tools'
and we removed the duplication of included buildSrc twice (2nd import as build-tools).
The elasticsearch internal build logic is kept in build-tools-internal as included build which allows us better handling of this project that its just being an buildSrc project (e.g. we can reference tasks directly from the root build etc.)
Convention logic applied to both projects will live in a new build-conventions project.
Rene Groeschke
Mark Vieira