sort log output
polishing
various Sonar plugin improvements

- get rid of bootstrapDir config property because Sonar doesn't allow to set it anymore
- don't set a default for sonar.projectDate because Sonar already provides the same default
- fixed module prefix for sonar properties
- use a unique sonar.projectKey, and URL-encode it (because Sonar uses it in URL query parameters)
- set sonar.environment properties
- use correct key for libraries
adapted test to previous changes