Update internal_lb.py
Update internal_lb.py

Change the 'type' property of compute.v1.healthCheck from 'tcp' to 'TCP' to pass DM validation.
aljim/deploymentmanager-samples,GoogleCloudPlatform/deploymentmanager-samples,aljim/deploymentmanager-samples,GoogleCloudPlatform/deploymentmanager-samples,jaivasanth-google/deploymentmanager-samples,jaivasanth-google/deploymentmanager-samples,aljim/deploymentmanager-samples,GoogleCloudPlatform/deploymentmanager-samples,aljim/deploymentmanager-samples