Some general tidy up

Did some general tidy up and added filter specific tags (so logsearch release can be used for other things, like regular linux-syslog messages)

- Switched to whitespace instead of tabs on the indentation for the cloudfoundry filter rules.
- Added filter tags as <filtername> (success) and _grokparsefailure-<filtername> (failure).
- Consolidated all tests belonging to a filter to a single file which has the same name as the filter.