Added CreateVirtualGuestBlockDeviceTemplateGroupService function to test_helpers
Added CreateVirtualGuestBlockDeviceTemplateGroupService function to test_helpers

maximilien/softlayer-go,mattcui/softlayer-go,TheWeatherCompany/softlayer-go,maximilien/softlayer-go,mattcui/softlayer-go,TheWeatherCompany/softlayer-go