Temporarily set astara_boot_command in config

Our published image is currently 1 commit behind trunk, so we need
to point this at the old console script until a newer image shows up
with the rename in place.

This can be reverted after mitaka-1.

Change-Id: Ieae165c98f23a1ff20ec75a09d79e495537cea2b

devstack/plugin.sh

@@ -93,6 +93,9 @@ function configure_astara() {
         iniset $ASTARA_CONF coordination enabled True
         iniset $ASTARA_CONF coordination url $ASTARA_COORDINATION_URL
     fi
+
+    # NOTE(adam_g): This is temporary and can be removed after mitaka-1
+    iniset $ASTARA_CONF DEFAULT astara_boot_command akanda-configure-management
 }
 
 function configure_astara_nova() {