Move git commit message creation into class

lib/db_revision.py

@@ -51,6 +51,10 @@ class DBRevision:
             return self.package < other.package
         return self.rev < other.rev
 
+    def git_commit_message(self):
+        # TODO: Normalize better the commit message
+        return f"{self.comment}\n\n{self}"
+
     def as_dict(self):
         """Return a dict we can put into YAML for test cases"""
         ret = {