releng: tito --test builds to have higher NVRs than released versions

Historically, Tito only modified the Release tag for `--test` builds.
Now, we also bump the Version field to ensure that Mock built from Git
revisions always has a higher NVR than (previously) released packages.

https://github.com/rpm-software-management/tito/releases/tag/tito-0.6.27-1

Author: praiskup

.tito/tito.props

@@ -4,3 +4,4 @@ tagger = tito.tagger.VersionTagger
 changelog_do_not_remove_cherrypick = 0
 changelog_format = %s
 fetch_sources = True
+test_version_suffix = .test