adapt bigtable system test to projectId auto-detection (#1833)
adapt bigtable system test to projectId auto-detection (#1833)


googleapis/google-cloud-node,googleapis/google-cloud-node,googleapis/google-cloud-node,jcking/google-cloud-node,ofrobots/google-cloud-node,callmehiphop/gcloud-node,GoogleCloudPlatform/gcloud-node,jcking/google-cloud-node,jcking/google-cloud-node,GoogleCloudPlatform/gcloud-node,GoogleCloudPlatform/gcloud-node,googleapis/google-cloud-node,ofrobots/google-cloud-node,jgeewax/gcloud-node,callmehiphop/gcloud-node,jgeewax/gcloud-node,ofrobots/google-cloud-node