Drop support from start_time and end_time options

This was used for Ad-hoc chargeback schedule. It is unused since 2010
(a59b87cf535fd464d56d145bac12873cff65ea7d).

app/models/chargeback.rb

@@ -227,12 +227,9 @@ def self.get_time_range(perf, interval, tz)
     end
   end
 
-  # @option options :start_time [DateTime] used with :end_time to create time range
-  # @option options :end_time [DateTime]
   # @option options :interval_size [Fixednum] Used with :end_interval_offset to generate time range
   # @option options :end_interval_offset
   def self.get_report_time_range(options, interval, tz)
-    return options[:start_time]..options[:end_time] if options[:start_time]
     raise _("Option 'interval_size' is required") if options[:interval_size].nil?
 
     end_interval_offset = options[:end_interval_offset] || 0

app/models/chargeback_container_image.rb

@@ -31,8 +31,6 @@ def self.build_results_for_report_ChargebackContainerImage(options)
     # Options:
     #   :rpt_type => chargeback
     #   :interval => daily | weekly | monthly
-    #   :start_time
-    #   :end_time
     #   :end_interval_offset
     #   :interval_size
     #   :owner => <userid>

app/models/chargeback_container_project.rb

@@ -30,8 +30,6 @@ def self.build_results_for_report_ChargebackContainerProject(options)
     # Options:
     #   :rpt_type => chargeback
     #   :interval => daily | weekly | monthly
-    #   :start_time
-    #   :end_time
     #   :end_interval_offset
     #   :interval_size
     #   :owner => <userid>

app/models/chargeback_vm.rb

@@ -53,8 +53,6 @@ def self.build_results_for_report_ChargebackVm(options)
     # Options:
     #   :rpt_type => chargeback
     #   :interval => daily | weekly | monthly
-    #   :start_time
-    #   :end_time
     #   :end_interval_offset
     #   :interval_size
     #   :owner => <userid>