Revert "added xtuple as devdep"

This reverts commit fe442db6723022851beddfb8933ed2beaa1949ec.
Revert "Revert "added xtuple as devdep""

This reverts commit bc4edce0acc7e175cdd55701b64d44cfbc48c61c.
Revert "remove xtuple as devdep"

This reverts commit 2a098ba4061b466823cadd232b3a84a67ca885b5.