Disable Greenwave gating by default

conf/config.py

@@ -124,6 +124,7 @@ class TestConfiguration(BaseConfiguration):
     RESOLVER = 'db'
 
     ALLOWED_GROUPS_TO_IMPORT_MODULE = set(['mbs-import-module'])
+    GREENWAVE_DECISION_CONTEXT = 'osci_compose_gate_modules'
 
 
 class ProdConfiguration(BaseConfiguration):

module_build_service/config.py

@@ -537,10 +537,8 @@ class Config(object):
         },
         'greenwave_decision_context': {
             'type': str,
-            'default': 'osci_compose_gate_modules',
-            'desc': 'The Greenwave decision context that whose messages should '
-                    'be handled by MBS. By default, MBS handles Greenwave '
-                    'messages for OSCI.',
+            'default': '',
+            'desc': 'The Greenwave decision context that determines a module\'s gating status.',
         },
         'allowed_disttag_marking_module_names': {
             'type': list,

module_build_service/scheduler/handlers/greenwave.py

@@ -63,6 +63,11 @@ def decision_update(config, session, msg):
         ``greenwave.decision.update``.
     :type msg: :class:`GreenwaveDecisionUpdate`
     """
+    if not config.greenwave_decision_context:
+        log.debug('Skip Greenwave message %s as MBS does not have GREENWAVE_DECISION_CONTEXT '
+                  'configured', msg.msg_id)
+        return
+
     if msg.decision_context != config.greenwave_decision_context:
         log.debug('Skip Greenwave message %s as MBS only handles message in '
                   'decision context %s',