Set @options only once

There are three possible callers of build_results_for_report_chargeback
each of them sets @options to the same value that is later passed in as
an argument.

Let's have a single place to set it.

In future I want to get a rid of class variable. But it will take few
moments before we get there.

app/models/chargeback.rb

@@ -8,6 +8,7 @@ class Chargeback < ActsAsArModel
 
   def self.build_results_for_report_chargeback(options)
     _log.info("Calculating chargeback costs...")
+    @options = options
 
     tz = Metric::Helper.get_time_zone(options[:ext_options])
     # TODO: Support time profiles via options[:ext_options][:time_profile]

app/models/chargeback_container_image.rb

@@ -41,7 +41,6 @@ def self.build_results_for_report_ChargebackContainerImage(options)
     #   :entity_id => 1/2/3.../all rails id of entity
 
     # Find Project by id or get all projects
-    @options = options
     provider_id = options[:provider_id]
     id = options[:entity_id]
     raise "must provide option :entity_id and provider_id" if id.nil? && provider_id.nil?

app/models/chargeback_container_project.rb

@@ -40,7 +40,6 @@ def self.build_results_for_report_ChargebackContainerProject(options)
     #   :entity_id => 1/2/3.../all rails id of entity
 
     # Find ContainerProjects according to any of these:
-    @options = options
     provider_id = options[:provider_id]
     project_id = options[:entity_id]
     filter_tag = options[:tag]

app/models/chargeback_vm.rb

@@ -93,7 +93,6 @@ def self.build_results_for_report_ChargebackVm(options)
     end
     return [[]] if vms.empty?
 
-    @options = options
     @vm_owners = vms.inject({}) { |h, v| h[v.id] = v.evm_owner_name; h }
 
     build_results_for_report_chargeback(options)