Remove Java 9 options for bootRun task
Remove Java 9 options for bootRun task

We currently want to build Java 8 compatible artifacts, so gradle needs
to be configured to use JDK 8. These arguments make the bootRun task
fail when used with JDK 8, hence the removal.

joffrey-bion/livedoc,joffrey-bion/livedoc,joffrey-bion/livedoc,joffrey-bion/livedoc,joffrey-bion/livedoc