Glance: start to use nova's glance configuration section

Commit 4b6e75b5f8037adbf63ac2f03dca17f0c8c0bc08 added support
of a neutron section. This updates the code to make use of
that section.

Change-Id: Ib9a0f2aeb0d91adeb567f79917804f0a89fdb6e1
diff --git a/lib/nova b/lib/nova
index 9dd6bb0..3d31d68 100644
--- a/lib/nova
+++ b/lib/nova
@@ -548,7 +548,7 @@
 
     iniset $NOVA_CONF DEFAULT ec2_dmz_host "$EC2_DMZ_HOST"
     iniset_rpc_backend nova $NOVA_CONF DEFAULT
-    iniset $NOVA_CONF DEFAULT glance_api_servers "$GLANCE_HOSTPORT"
+    iniset $NOVA_CONF glance api_servers "$GLANCE_HOSTPORT"
 }
 
 function init_nova_cells {