All of the negative vision vpc sc tests should use the same file. (#8439)
All of the negative vision vpc sc tests should use the same file. (#8439)

* All of the negative vision vpc sc tests should use the same file.

* One more negative vision vpc sc test image reference to update. Also increase the lro waiting seconds a bit to be safe.

tswast/google-cloud-python,tswast/google-cloud-python,tseaver/google-cloud-python,googleapis/google-cloud-python,GoogleCloudPlatform/gcloud-python,tseaver/google-cloud-python,GoogleCloudPlatform/gcloud-python,tseaver/google-cloud-python,googleapis/google-cloud-python,tswast/google-cloud-python