Make this host-specific instead of group-specific.

inventory/group_vars/releng-stg

@@ -5,10 +5,5 @@ koji_topurl: "http://kojipkgs.fedoraproject.org/"
 
 nfs_mount_opts: "rw,hard,bg,intr,noatime,nodev,nosuid,nfsvers=4"
 
-# This line should be removed whenever the modularity-wg is done doing its tests
-# on composer.stg.
-#   See:  https://fedorahosted.org/rel-eng/ticket/6441
-fedmsg_validate_signatures: False
-
 mem_size: 8192
 num_cpus: 4

inventory/host_vars/composer.stg.phx2.fedoraproject.org

@@ -21,6 +21,11 @@ kojihub_scheme: http
 
 virt_install_command: "{{ virt_install_command_two_nic }}"
 
+# This line should be removed whenever the modularity-wg is done doing its tests
+# on composer.stg.
+#   See:  https://fedorahosted.org/rel-eng/ticket/6441
+fedmsg_validate_signatures: False
+
 # These are consumed by a task in roles/fedmsg/base/main.yml
 fedmsg_certs:
 - service: shell