[Bugfix] Pass Object- instead of String-array to logger varargs
Remove duplicate information from log message
Add missing parameter to log statement
Change debug level of greeting messages (GreeterJob) to debug

The logging was primarily used to make sure jobs are running.
This should be proofed now and logging the greeting messages
with log level 'debug' should be sufficient.
Improve log message
Improve log message
Add missing parameter to log statement
Merge pull request #337 from myniva/pr/logging-improvements

Improve and fix logging in various places