Model changes for instance last_seen field to replace modified (#10870)

* Model changes for instance last_seen field to replace modified

* Break up refresh_capacity into smaller units

* Rename execution node methods, fix last_seen clustering

* Use update_fields to make it clear save only affects capacity

* Restructing to pass unit tests

* Fix bug where a PATCH did not update capacity value

tools/docker-compose/ansible/roles/sources/templates/receptor-awx.conf.j2

@@ -2,8 +2,7 @@
 - node:
     id: awx_{{ item }}
 
-- log-level:
-    debug
+- log-level: info
 
 - tcp-listener:
     port: 2222