Add/delete and modify tunnels.

IMPORTANT: Schema shows an object for a single tunnel. For creation of multiple tunnels simultaneously, you can construct an object of the form: { 'tunnel1': {schema}, 'tunnel2': {schema}}. You may want to perform a GET operation and copy the RESPONSE JSON and modify that to see how the POST operation works.
When a list of tunnel keys are POSTed back to the server, the server checks for new keys. These tunnels are added. It looks for missing keys. These tunnels are deleted. All other tunnels are modified to input settings.