sonarqube template/plugin in GitLab CI

Closing update: You can read more about the integration between GitLab and SonarQube at SonarQube's website. Please file a new issue if needed rather than re-open this one.

Description

Customer request to add plugin/template for sonarqube

Proposal

Create GitLab CI template for sonarqube

Links / references

https://wiki.jenkins-ci.org/display/JENKINS/SonarQube+plugin

@dblessing please consider adding some substance to my vague description