ps: Change proc.name to proc.name()
syslog_ng: Bugfix in unit test
syslog_ng: Add execution module.
syslog_ng: Add dictionary return value to all public function.

The dictionary contains the following keys: retcode, stdout, stderr.
syslog_ng: Add documentation for syslog_ng execution module.
syslog_ng: Add documentation to syslog_ng state.
syslog_ng: Add to the docs and fix sphinx warnings.
Add some metadata about the syslog_ng modules (maintainer, etc.).