Set default_boot_option to local by default

PROD-33749

Change-Id: I746712361d8659af024cf4fff28f47ee2ed35fa0
diff --git a/ironic/conductor/single.yml b/ironic/conductor/single.yml
index 46a06b9..88179a3 100644
--- a/ironic/conductor/single.yml
+++ b/ironic/conductor/single.yml
@@ -50,3 +50,4 @@
         - ipmitool-socat
         - no-console
       pxe_append_params: 'nofb nomodeset vga=normal ipa-insecure=1'
+      default_boot_option: local