vendor: Add dependencies for discosrv

vendor/github.com/cznic/ql/errors.go

@@ -0,0 +1,18 @@
+// Copyright 2014 The ql Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ql
+
+import (
+	"errors"
+)
+
+var (
+	errBeginTransNoCtx          = errors.New("BEGIN TRANSACTION: Must use R/W context, have nil")
+	errCommitNotInTransaction   = errors.New("COMMIT: Not in transaction")
+	errDivByZero                = errors.New("division by zero")
+	errIncompatibleDBFormat     = errors.New("incompatible DB format")
+	errNoDataForHandle          = errors.New("read: no data for handle")
+	errRollbackNotInTransaction = errors.New("ROLLBACK: Not in transaction")
+)