Control the visibility and use of hop node Instances

- the list, detail, and health check API views should not include them
- the Instance-InstanceGroup association views should not allow them
  to be changed
- the ping view excludes them
- list_instances management command excludes them
- Instance.set_capacity_value sets hop nodes to 0 capacity
- TaskManager will exclude them from the nodes available for job execution
- TaskManager.reap_jobs_from_orphaned_instances will consider hop nodes
  to be an orphaned instance
- The apply_cluster_membership_policies task will not manipulate hop nodes
- get_broadcast_hosts will ignore hop nodes
- active_count also will ignore hop nodes

awx/main/models/ha.py

@@ -29,7 +29,7 @@ from awx.main.models.mixins import RelatedJobsMixin
 # ansible-runner
 from ansible_runner.utils.capacity import get_cpu_count, get_mem_in_bytes
 
-__all__ = ('Instance', 'InstanceGroup', 'TowerScheduleState')
+__all__ = ('Instance', 'InstanceGroup', 'InstanceLink', 'TowerScheduleState')
 
 logger = logging.getLogger('awx.main.models.ha')
 
@@ -215,7 +215,7 @@ class Instance(HasPolicyEditsMixin, BaseModel):
 
     def set_capacity_value(self):
         """Sets capacity according to capacity adjustment rule (no save)"""
-        if self.enabled:
+        if self.enabled and self.node_type != 'hop':
             lower_cap = min(self.mem_capacity, self.cpu_capacity)
             higher_cap = max(self.mem_capacity, self.cpu_capacity)
             self.capacity = lower_cap + (higher_cap - lower_cap) * self.capacity_adjustment
@@ -320,7 +320,7 @@ class InstanceGroup(HasPolicyEditsMixin, BaseModel, RelatedJobsMixin):
 
     @property
     def capacity(self):
-        return sum([inst.capacity for inst in self.instances.all()])
+        return sum(inst.capacity for inst in self.instances.all())
 
     @property
     def jobs_running(self):