Integration Tests for HTTP Indexer

[mikejritter]

A start at getting the integration tests to work for the http indexer module.

Some notes:

• I was getting some errors with MockServer (even after updating to a newer version) so I decided to try out WireMock as an alternative which is seemingly working well
• I didn't see any messages being sent to the fcrepo jms endpoint so I opted to remove it
• I wasn't entirely sure what we should be expecting as far as headers being sent to the http jms endpoint, should probably double check with Danny
• The RouteDeleteIT still needs to be done

[demiankatz]

Thanks, @mikejritter, this is great! I'll merge it now and continue working on it back in the original PR. We can discuss the header details with Danny at our meeting later today.