Splunk host and port should be configurable

[petterik]

Did: Started Splunk on port 10000 and 10089 instead of the default 8000 and 8089.
Expected: All views to show.
Happened: Multi-Git never appeared.

Multi-Git/repository view is generated by a script and then calls a REST endpoint when it's done. This REST endpoint is hardcoded to be 8089. Also the host is hardcoded to localhost.

These should be configurable and the whole code should be searched for localhost:8000 and localhost:8089.