added WaitForVirtualGuestToHaveNoActiveTransactionsOrToErr for use with delete_vm test in bosh-softlayer-cpi
added WaitForVirtualGuestToHaveNoActiveTransactionsOrToErr for use with
delete_vm test in bosh-softlayer-cpi

[#103962888]

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