remove unused code

weed/pb/filer_pb/signature.go

@@ -1,13 +0,0 @@
-package filer_pb
-
-func (r *CreateEntryRequest) AddSignature(sig int32) {
-	r.Signatures = append(r.Signatures, sig)
-}
-func (r *CreateEntryRequest) HasSigned(sig int32) bool {
-	for _, s := range r.Signatures {
-		if s == sig {
-			return true
-		}
-	}
-	return false
-}