Add aggregate_memory to container project

app/models/container_project.rb

@@ -24,6 +24,7 @@ class ContainerProject < ApplicationRecord
   has_many :archived_container_groups, :foreign_key => "old_container_project_id", :class_name => "ContainerGroup"
   has_many :persistent_volume_claims
   has_many :miq_alert_statuses, :as => :resource, :dependent => :destroy
+  has_many :computer_systems, :through => :container_nodes
 
   # Needed for metrics
   has_many :metrics,                :as => :resource
@@ -69,6 +70,10 @@ def perf_rollup_parents(interval_name = nil)
     []
   end
 
+  def aggregate_memory
+    ext_management_system.aggregate_memory(computer_systems)
+  end
+
   def disconnect_inv
     return if archived?
     _log.info("Disconnecting Container Project [#{name}] id [#{id}] from EMS [#{ext_management_system.name}] id [#{ext_management_system.id}]")