Remove problamatic step preventing unlock

Change-Id: Ib6d90cf70e63c303a7289f2ba1a5b895598963d9
diff --git a/tools/onos-yang-tools-build-release b/tools/onos-yang-tools-build-release
index 6b96c39..8df7d68 100755
--- a/tools/onos-yang-tools-build-release
+++ b/tools/onos-yang-tools-build-release
@@ -34,6 +34,3 @@
 git commit -am"Bumping version to $OYT_SNAPSHOT"
 git push origin $OYT_BRANCH
 git push origin $OYT_TAG
-
-
-unset OYT_VERSION OYT_SNAPSHOT OYT_BRANCH OYT_TAG