grpc/auth: switch tests to use HTTP instead of GRPC
grpc/auth: switch tests to use HTTP instead of GRPC

Change-Id: I79f565a3e34768a36f7e8d2575c19b24f28fa422
Reviewed-on: https://upspin-review.googlesource.com/7002
Reviewed-by: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@google.com>

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