Correct status code for initv scripts when logstash alread running

The java and tarball scripts return a status code of 1 when a start command when logstash is already running.According to [the Fedora project](http://fedoraproject.org/wiki/Packaging:SysVInitScript) a status code of 0 is expected in this scenario. This causes converge errors as documented in issue #373. This corrects the problem under the 0.9.2 branch on AWS Linux.