Replace pike symlink

This patch fixes upgrade if files/pike is symlink.
files/pike is a copy of files/ocata

Change-Id: I73038ac1c43e718f0c499750bca0af858b06e397
Related-Prod: PROD-17540
diff --git a/debian/salt-formula-ironic.postrm b/debian/salt-formula-ironic.postrm
new file mode 100644
index 0000000..b12624f
--- /dev/null
+++ b/debian/salt-formula-ironic.postrm
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+set -e
+
+dpkg-maintscript-helper symlink_to_dir \
+        /usr/share/salt-formulas/env/ironic/files/pike /usr/share/salt-formulas/env/ironic/files/ocata salt-formula-ironic -- "$@"
+
+#DEBHELPER#
+
+exit 0