reimplement licensing to work with RHSM and entitlement uploads

Co-authored-by: Christian Adams <chadams@redhat.com>

awx/conf/models.py

@@ -78,14 +78,6 @@ class Setting(CreatedModifiedModel):
     def get_cache_id_key(self, key):
         return '{}_ID'.format(key)
 
-    def display_value(self):
-        if self.key == 'LICENSE' and 'license_key' in self.value:
-            # don't log the license key in activity stream
-            value = self.value.copy()
-            value['license_key'] = '********'
-            return value
-        return self.value
-
 
 import awx.conf.signals  # noqa