Add pike symlink to ocata

Link pike config to ocata folder to be able install Pike version
by this formula.

Related-Prod: PROD-15582

Change-Id: I9e00a7f489ef9a87920e81f5a9b2c2afa178afa2
diff --git a/ironic/files/pike b/ironic/files/pike
new file mode 120000
index 0000000..d5e8ce2
--- /dev/null
+++ b/ironic/files/pike
@@ -0,0 +1 @@
+ocata
\ No newline at end of file