Add a way to configure JVM options for Compute Engine about docker-sonarqube

[Godin]

Properties mentioned in https://github.com/SonarSource/sonarqube/blob/5.6.6/sonar-application/src/main/assembly/conf/sonar.properties that control JVM options of underlying processes (sonar.web.javaOpts, sonar.ce.javaOpts and sonar.search.javaOpts) can be passed as following

docker run -d sonarqube -Dsonar.ce.javaOpts=-Xmx2048m

and equivalent of this in a docker-compose notation:

version: "2"

services:
  sonarqube:
    image: sonarqube
    command: -Dsonar.ce.javaOpts=-Xmx2048m

[rsvoboda]

Thank you for the tip, it works nicely. I also removed usage of SONARQUBE_WEB_JVM_OPTS and use -Dfoo.bar approach.