* Switched to embedded Google checkstyle rules
Moved the configuration out of the execution to make it used in all
executions. Fixes#1016
* #1016: Moved checkstyle configuration back into execution
This refactoring may be better done in a new issue as it may have too
many implication.
* Replaced consoleOutput and failsOnError by failOnViolation
consoleOutput outputs everything while failsOnError just fails the build
but doesn't log the error. failOnViolation fails on a violation and logs
it (logViolationsToConsole defaults to true).
The missing class PreconditionViolationException is contained in
junit-platform-commons which comes in transitively by this JUnit
version. junit-jupiter-api had to be added because
spring-boot-dependencies imports an older version of this dependency.
Kai WinterandIlkka Seppälä