Revert "Update HenshinResource to use XMI IDs by default"

This reverts commit de0d9dea7c3efeb991e86a71439a87ef8f12ceee.

Change-Id: Ia6f25deb4f5979b80ca800170d33e43344fcd4ef
Reason: After this commit, the build failed due to a problem with the unit tests for the Giraph code generation component. I revert the commit to see if it is indeed the reason for the failing build.
1 file changed