Fix public subnet creation command

There was no space after the --project option in the command that
creates the public subnet, thus if any option follows, the option itself
will be parsed as part of the value passed to the --project option. This
change just adds the missing space.

Change-Id: I1e7375578342a82717222e902fcd65a4a62e33a7
diff --git a/lib/neutron_plugins/services/l3 b/lib/neutron_plugins/services/l3
index ccb5398..a8844c4 100644
--- a/lib/neutron_plugins/services/l3
+++ b/lib/neutron_plugins/services/l3
@@ -305,7 +305,7 @@
     local admin_project_id
     admin_project_id=$(openstack project list | grep " admin " | get_field 1)
     die_if_not_set $LINENO admin_project_id "Failure retrieving project_id for admin"
-    local subnet_params="--ip-version 4 --project $admin_project_id"
+    local subnet_params="--ip-version 4 --project $admin_project_id "
     subnet_params+="${Q_FLOATING_ALLOCATION_POOL:+--allocation-pool $Q_FLOATING_ALLOCATION_POOL} "
     if [[ -n "$PUBLIC_NETWORK_GATEWAY" ]]; then
         subnet_params+="--gateway $PUBLIC_NETWORK_GATEWAY "