util: Port all code to new errwrap package

This should keep things more uniform.

integration/cluster.go

@@ -25,8 +25,9 @@ import (
 	"path"
 	"time"
 
+	"github.com/purpleidea/mgmt/util/errwrap"
+
 	multierr "github.com/hashicorp/go-multierror"
-	errwrap "github.com/pkg/errors"
 )
 
 // Cluster represents an mgmt cluster. It uses the instance building blocks to

integration/instance.go

@@ -29,8 +29,7 @@ import (
 	"syscall"
 
 	"github.com/purpleidea/mgmt/recwatch"
-
-	errwrap "github.com/pkg/errors"
+	"github.com/purpleidea/mgmt/util/errwrap"
 )
 
 const (

integration/patterns.go

@@ -21,7 +21,7 @@ import (
 	"context"
 	"time"
 
-	errwrap "github.com/pkg/errors"
+	"github.com/purpleidea/mgmt/util/errwrap"
 )
 
 // SimpleDeployLang is a helper method that takes a struct and runs a sequence

integration/util.go

@@ -26,7 +26,7 @@ import (
 	"runtime"
 	"strconv"
 
-	errwrap "github.com/pkg/errors"
+	"github.com/purpleidea/mgmt/util/errwrap"
 )
 
 const (