This modifies the userinfo endpoint to return appropriate errors;
PermissionDenied for untrusted peers and Unimplemented because
the endpoint isn't implemented
Change-Id: I5109bb204b5e1ce2e21fe16b003991b6c900a8ce
This change stubs userinfo endpoint from storj/common/pb/userinfo.proto.
It also adds config for allowed peers, and a method for verifying peers.
Issue: https://github.com/storj/storj/issues/5358
Change-Id: I057a0e873a9e9b3b9ad0bba69305f0d708bd9b9e