fix name of scheduler_driver in produced nova.conf

Fixes bug #1202174.  The nova.conf config variable that configures which
scheduler to use is scheduler_driver, not compute_scheduler_driver.

Change-Id: I775cae40edc9f8f55177f9d95cdbaa9416c4bfcd
diff --git a/lib/nova b/lib/nova
index 849ec57..cb4b8b7 100644
--- a/lib/nova
+++ b/lib/nova
@@ -368,7 +368,7 @@
     iniset $NOVA_CONF DEFAULT allow_resize_to_same_host "True"
     iniset $NOVA_CONF DEFAULT api_paste_config "$NOVA_API_PASTE_INI"
     iniset $NOVA_CONF DEFAULT rootwrap_config "$NOVA_CONF_DIR/rootwrap.conf"
-    iniset $NOVA_CONF DEFAULT compute_scheduler_driver "$SCHEDULER"
+    iniset $NOVA_CONF DEFAULT scheduler_driver "$SCHEDULER"
     iniset $NOVA_CONF DEFAULT dhcpbridge_flagfile "$NOVA_CONF"
     iniset $NOVA_CONF DEFAULT force_dhcp_release "True"
     iniset $NOVA_CONF DEFAULT fixed_range "$FIXED_RANGE"