Rearchitect project update strategy

* Instead of using a fanout for project updates initial project
  updates will sync the latest commit hash
* Prior to a node running a job it will ensure that the latest project
  is synced

awx/api/serializers.py

@@ -914,7 +914,7 @@ class ProjectSerializer(UnifiedJobTemplateSerializer, ProjectOptionsSerializer):
     class Meta:
         model = Project
         fields = ('*', 'organization', 'scm_delete_on_next_update', 'scm_update_on_launch',
-                  'scm_update_cache_timeout', 'timeout') + \
+                  'scm_update_cache_timeout', 'scm_revision', 'timeout',) + \
                  ('last_update_failed', 'last_updated')  # Backwards compatibility
         read_only_fields = ('scm_delete_on_next_update',)
 
@@ -986,7 +986,7 @@ class ProjectUpdateSerializer(UnifiedJobSerializer, ProjectOptionsSerializer):
 
     class Meta:
         model = ProjectUpdate
-        fields = ('*', 'project')
+        fields = ('*', 'project', 'job_type')
 
     def get_related(self, obj):
         res = super(ProjectUpdateSerializer, self).get_related(obj)