Replace pike symlink

This patch fix upgrade if files/pike is symlink.

Change-Id: Ide6128e106c446b4c57bced07104e4faffb2daee
Related-Prod: PROD-17540
diff --git a/debian/salt-formula-glance.preinst b/debian/salt-formula-glance.preinst
new file mode 100644
index 0000000..eaf2500
--- /dev/null
+++ b/debian/salt-formula-glance.preinst
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+set -e
+
+dpkg-maintscript-helper symlink_to_dir \
+        /usr/share/salt-formulas/env/glance/files/pike /usr/share/salt-formulas/env/glance/files/ocata salt-formula-glance -- "$@"
+
+#DEBHELPER#
+
+exit 0