Improve tailscale option handling

[josh]

Partially addresses #4.

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cmd/hubproxy/main.go:86

• The new function viperReadFile should have test coverage to ensure it correctly handles file-prefixed values and errors.

func viperReadFile(key string) {

cmd/hubproxy/main.go:183

• The new handling of Tailscale options (ts-authkey and ts-hostname) should have test coverage to ensure they are correctly read and used.

if authKey := viper.GetString("ts-authkey"); authKey != "" {

cmd/hubproxy/main.go:205

• [nitpick] Reassigning the variable hostname could be confusing. Consider using a different variable name for the reassigned value.

hostname = status.Self.DNSName

[tnm]

very nice.