MBSConsoleHandler: show status of ongoing repository downloads

When downloading files from Koji to make a local repository, display
a temporary status of which files are being displayed to the console
appended after any log messages. Updates are done by erasing the status
that was written, adding a log message, then writing the status again.

module_build_service/common/models.py

@@ -606,6 +606,10 @@ class ModuleBuild(MBSBase):
     def nvr_string(self):
         return kobo.rpmlib.make_nvr(self.nvr)
 
+    @property
+    def nsvc(self):
+        return "{}:{}:{}:{}".format(self.name, self.stream, self.version, self.context)
+
     @classmethod
     def create(
         cls,