Fail server startup if can not connect to DB
Use correct temp dir for Ruby on Rails app
SONAR-4898 add missing tests
SONAR-4898 add missing tests
Automatic merge from branch-4.5

* origin/branch-4.5:
  SONAR-4898 add missing tests
  SONAR-4898 add missing tests
  Use correct temp dir for Ruby on Rails app
  Fail server startup if can not connect to DB