Revert "un-rename cct key for checksum"
Revert "un-rename cct key for checksum"

This reverts commit e18aec7832153600077702a4d9d340786c551e4c.

I've just modified cct to use md5sum so it's consistent everywhere.

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