Upgrade sonar to new 6.2 installation (#456)

* Upgrade to new sonar instance. Fix new identified issues.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

README.md

@@ -5,7 +5,7 @@
 Eclipse [hawkBit](https://projects.eclipse.org/projects/iot.hawkbit) is an domain independent back end solution for rolling out software updates to constrained edge devices as well as more powerful controllers and gateways connected to IP based networking infrastructure.
 
 Build: [![Circle CI](https://circleci.com/gh/eclipse/hawkbit.svg?style=shield)](https://circleci.com/gh/eclipse/hawkbit) 
- [![Codacy Badge](https://api.codacy.com/project/badge/Grade/83b1ace1fba94ea2aec93b202b52f39a)](https://www.codacy.com/app/kai-zimmermann/hawkbit?utm_source=github.com&utm_medium=referral&utm_content=eclipse/hawkbit&utm_campaign=Badge_Grade) [![SonarQuality](https://sonar.eu-gb.mybluemix.net/api/badges/gate?key=org.eclipse.hawkbit:hawkbit-parent)](https://sonar.eu-gb.mybluemix.net) [![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.eclipse.hawkbit/hawkbit-parent/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.eclipse.hawkbit/hawkbit-parent)
+ [![Codacy Badge](https://api.codacy.com/project/badge/Grade/83b1ace1fba94ea2aec93b202b52f39a)](https://www.codacy.com/app/kai-zimmermann/hawkbit?utm_source=github.com&utm_medium=referral&utm_content=eclipse/hawkbit&utm_campaign=Badge_Grade) [![SonarQuality](https://sonar.ops.bosch-iot-rollouts.com/api/badges/gate?key=org.eclipse.hawkbit:hawkbit-parent)](https://sonar.ops.bosch-iot-rollouts.com) [![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.eclipse.hawkbit/hawkbit-parent/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.eclipse.hawkbit/hawkbit-parent)
 
 # Documentation