Use an RMap instance for integration tests

It is now possible (via Maven and cargo) to run an instance of the RMap service.  Have cargo deploy RMap in the `pre-integration-test` lifecycle, and point all ITs to that instance.  Remove "fake rmap" where it can be replaced by the real deal.

See [developer documentation](https://github.com/rmap-project/rmap/blob/master/DEVELOPER.md)