Remove redundant human_id fields when creating and updating datamodel

For the reason, please see:
[1]. http://eavesdrop.openstack.org/irclogs/%23openstack-watcher/%23openstack-watcher.2019-06-19.log.html
[2]. http://eavesdrop.openstack.org/meetings/watcher/2019/watcher.2019-06-19-08.00.log.html#l-47

Change-Id: I4284397aa987565f4cfc2697907a879d7d6492e9
Related-Bug: #1833665

watcher/decision_engine/model/collector/nova.py

@@ -357,9 +357,6 @@ class ModelBuilder(object):
         flavor = instance.flavor
         instance_attributes = {
             "uuid": instance.id,
-            # TODO(chenker) human_id is deprecated for removal. For the reason,
-            # please reference bug 1833665.
-            "human_id": instance.human_id,
             "name": instance.name,
             "memory": flavor["ram"],
             "disk": flavor["disk"],