Splunk

Added Sonar app manifest.

First release. Tested on Splunk 8.1.2

• splunk-apps
• splunk-indexes
• splunk-info
• splunk-inputs
• splunk-jobs
• splunk-license-messages
• splunk-licenses
• splunk-output-syslogs
• splunk-saved-searches
• splunk-search
• splunk-settings
• splunk-users