per-tag configuration of mocks' --new-chroot

builder/kojid

@@ -364,6 +364,11 @@ class BuildRoot(object):
         #if self.options.debug_mock:
         #    cmd.append('--debug')
         # TODO: should we pass something like --verbose --trace instead?
+        if 'mock.new_chroot' in self.config['extra']:
+            if self.config['extra']['mock.new_chroot']:
+                cmd.append('--new-chroot')
+            else:
+                cmd.append('--old-chroot')
         cmd.extend(args)
         self.logger.info(' '.join(cmd))
         workdir = getattr(self, 'workdir', None)