Make spanner instance id unique in spanner.jinja (#99)
Make spanner instance id unique in spanner.jinja (#99)

This helps avoid racing condition when running integration tests
aljim/deploymentmanager-samples,aljim/deploymentmanager-samples,GoogleCloudPlatform/deploymentmanager-samples,aljim/deploymentmanager-samples,GoogleCloudPlatform/deploymentmanager-samples,GoogleCloudPlatform/deploymentmanager-samples,aljim/deploymentmanager-samples