fix test_unit_generate_configuration
fix test_unit_generate_configuration

These tests broke when the dist_git functionality was broken out
to a plugin.

(Separately TODO: write a test for the dist_git plugin.)

jboss-container-images/concreate,jboss-container-images/concreate,jboss-dockerfiles/dogen,goldmann/dogen,goldmann/dogen,jboss-dockerfiles/dogen,jboss-container-images/concreate,goldmann/dogen,jboss-dockerfiles/dogen