Add EXTRA_BAREMETAL_OPTS to stack.sh

Allow the passing of extra options to the [baremetal] option group
by specifying EXTRA_BAREMETAL_OPTS, using the same format as the
existing flag EXTRA_OPTS.

Change-Id: I209675786c6a33a68d83a371292a1e1749ecb14c
diff --git a/stack.sh b/stack.sh
index 5a02e07..ebb0bad 100755
--- a/stack.sh
+++ b/stack.sh
@@ -1129,6 +1129,12 @@
         iniset $NOVA_CONF baremetal power_manager $BM_POWER_MANAGER
         iniset $NOVA_CONF baremetal tftp_root /tftpboot
 
+        # Define extra baremetal nova conf flags by defining the array ``EXTRA_BAREMETAL_OPTS``.
+        for I in "${EXTRA_BAREMETAL_OPTS[@]}"; do
+           # Attempt to convert flags to options
+           iniset $NOVA_CONF baremetal ${I//=/ }
+        done
+
     # Default
     # -------