Removes most instances of pb.SignedMessage (there's more to take out but they shouldn't hurt anyone as is).
There used to be places in psserver where a PieceID was hmac'd with the SatelliteID, which was gotten from a SignedMessage. This PR makes it so some functions access the SatelliteID from the Payer Bandwidth Allocation instead.
This requires passing a SatelliteID into psserver functions where they weren't before, so the following proto messages have been changed:
* PieceId - satellite_id field added
This is so the psserver.Piece function has access to the SatelliteID when it needs to get the namespaced pieceID.
This proto message should probably be renamed to PieceRequest, or a new PieceRequest message should be created so this isn't misnamed.
* PieceDelete - satellite_id field added
This is so the psserver.Delete function has access to the SatelliteID when receiving a request to Delete.
Update statdb args/return values to minimize structs
Simplify statdb.Update() to update all stats instead of an arbitrary subset determined by flags
Remove CreateIfNotExists logic from statdb.Update()
Simplify audit code structure
* preparing for use of `customtype` gogo extension with `NodeID` type
* review changes
* preparing for use of `customtype` gogo extension with `NodeID` type
* review changes
* wip
* tests passing
* wip fixing tests
* more wip test fixing
* remove NodeIDList from proto files
* linter fixes
* linter fixes
* linter/review fixes
* more freaking linter fixes
* omg just kill me - linterrrrrrrr
* travis linter, i will muder you and your family in your sleep
* goimports everything - burn in hell travis
* goimports update
* go mod tidy
