Found the bug.

roles/openshift-apps/greenwave/templates/buildconfig.yml

@@ -18,8 +18,7 @@ spec:
           python-requests \
           PyYAML \
           fedmsg-hub \
-          python2-flask \
-          nc
+          python2-flask
       RUN dnf -v -y install --setopt=tsflags=nodocs \
           https://kojipkgs.fedoraproject.org//packages/greenwave/0.3/2.fc26/noarch/greenwave-0.3-2.fc26.noarch.rpm
       # create a symlink for configuring the fedmsg consumers.

roles/openshift-apps/greenwave/templates/configmap.yml

@@ -267,7 +267,7 @@ data:
       # STG greenwave should listen to the STG bus.
       endpoints=dict(
         staging_gateway=[
-            'tcp://hub.stg.fedoraproject.org:9940',
+            'tcp://stg.fedoraproject.org:9940',
         ],
       ),
 {% else %}