nginx: userauth: internal endpoint for user verification
nginx: userauth: internal endpoint for user verification

Set up an internal endpoint for user verification. Skip request body and reset
Content-Length header as authentication data is not transported in request body.

Include the URI of original request in X-Original-URI header.

Signed-off-by: Maciej Borzecki <f609d9f713abcd5f8f0e51f08dc151638a7681e7@rndity.com>

maciejmrowiec/mender-api-gateway-docker