[packaging] Switch using 3.0 native source format

    Related-Prod: https://mirantis.jira.com/browse/PROD-21900

Change-Id: I6a3552281def455bb298a7f4b2ee5afa25de0c54
diff --git a/debian/source/format b/debian/source/format
index 163aaf8..89ae9db 100644
--- a/debian/source/format
+++ b/debian/source/format
@@ -1 +1 @@
-3.0 (quilt)
+3.0 (native)