Pass resource group as a string to power operation methods

Fixes BZ #1509275

app/models/manageiq/providers/azure/cloud_manager/vm/operations/power.rb

@@ -11,7 +11,7 @@ module ManageIQ::Providers::Azure::CloudManager::Vm::Operations::Power
   end
 
   def raw_suspend
-    provider_service.stop(name, resource_group)
+    provider_service.stop(name, resource_group.name)
     update_attributes!(:raw_power_state => "VM stopping")
   end
 
@@ -20,22 +20,22 @@ def validate_pause
   end
 
   def raw_start
-    provider_service.start(name, resource_group)
+    provider_service.start(name, resource_group.name)
     update_attributes!(:raw_power_state => "VM starting")
   end
 
   def raw_stop
-    provider_service.deallocate(name, resource_group)
+    provider_service.deallocate(name, resource_group.name)
     update_attributes!(:raw_power_state => "VM deallocating")
   end
 
   def raw_restart
-    provider_service.restart(name, resource_group)
+    provider_service.restart(name, resource_group.name)
     update_attributes!(:raw_power_state => "VM starting")
   end
 
   def reboot_guest
-    provider_service.restart(name, resource_group)
+    provider_service.restart(name, resource_group.name)
     update_attributes!(:raw_power_state => "VM starting")
   end
 end