util: Port all code to new errwrap package

This should keep things more uniform.

engine/graph/actions.go

@@ -25,9 +25,9 @@ import (
 
 	"github.com/purpleidea/mgmt/engine"
 	"github.com/purpleidea/mgmt/pgraph"
+	"github.com/purpleidea/mgmt/util/errwrap"
 
 	multierr "github.com/hashicorp/go-multierror"
-	errwrap "github.com/pkg/errors"
 	"golang.org/x/time/rate"
 )
 

engine/graph/autoedge/autoedge.go

@@ -22,9 +22,9 @@ import (
 
 	"github.com/purpleidea/mgmt/engine"
 	"github.com/purpleidea/mgmt/pgraph"
+	"github.com/purpleidea/mgmt/util/errwrap"
 
 	multierr "github.com/hashicorp/go-multierror"
-	errwrap "github.com/pkg/errors"
 )
 
 // AutoEdge adds the automatic edges to the graph.

engine/graph/autogroup.go

@@ -24,8 +24,7 @@ import (
 	"github.com/purpleidea/mgmt/engine/graph/autogroup"
 	"github.com/purpleidea/mgmt/pgraph"
 	"github.com/purpleidea/mgmt/util"
-
-	errwrap "github.com/pkg/errors"
+	"github.com/purpleidea/mgmt/util/errwrap"
 )
 
 // AutoGroup runs the auto grouping on the loaded graph.

engine/graph/autogroup/autogroup.go

@@ -22,8 +22,7 @@ import (
 
 	"github.com/purpleidea/mgmt/engine"
 	"github.com/purpleidea/mgmt/pgraph"
-
-	errwrap "github.com/pkg/errors"
+	"github.com/purpleidea/mgmt/util/errwrap"
 )
 
 // AutoGroup is the mechanical auto group "runner" that runs the interface spec.

engine/graph/autogroup/autogroup_test.go

@@ -31,8 +31,7 @@ import (
 	"github.com/purpleidea/mgmt/engine/traits"
 	"github.com/purpleidea/mgmt/pgraph"
 	"github.com/purpleidea/mgmt/util"
-
-	errwrap "github.com/pkg/errors"
+	"github.com/purpleidea/mgmt/util/errwrap"
 )
 
 func init() {

engine/graph/autogroup/nonreachability.go

@@ -19,8 +19,7 @@ package autogroup
 
 import (
 	"github.com/purpleidea/mgmt/pgraph"
-
-	errwrap "github.com/pkg/errors"
+	"github.com/purpleidea/mgmt/util/errwrap"
 )
 
 // NonReachabilityGrouper is the most straight-forward algorithm for grouping.

engine/graph/autogroup/util.go

@@ -19,8 +19,7 @@ package autogroup
 
 import (
 	"github.com/purpleidea/mgmt/pgraph"
-
-	errwrap "github.com/pkg/errors"
+	"github.com/purpleidea/mgmt/util/errwrap"
 )
 
 // VertexMerge merges v2 into v1 by reattaching the edges where appropriate,

engine/graph/engine.go

@@ -26,10 +26,10 @@ import (
 	"github.com/purpleidea/mgmt/converger"
 	"github.com/purpleidea/mgmt/engine"
 	"github.com/purpleidea/mgmt/pgraph"
+	"github.com/purpleidea/mgmt/util/errwrap"
 	"github.com/purpleidea/mgmt/util/semaphore"
 
 	multierr "github.com/hashicorp/go-multierror"
-	errwrap "github.com/pkg/errors"
 )
 
 // Engine encapsulates a generic graph and manages its operations.

engine/graph/sendrecv.go

@@ -23,9 +23,9 @@ import (
 
 	"github.com/purpleidea/mgmt/engine"
 	engineUtil "github.com/purpleidea/mgmt/engine/util"
+	"github.com/purpleidea/mgmt/util/errwrap"
 
 	multierr "github.com/hashicorp/go-multierror"
-	errwrap "github.com/pkg/errors"
 )
 
 // SendRecv pulls in the sent values into the receive slots. It is called by the

engine/graph/state.go

@@ -26,8 +26,7 @@ import (
 	"github.com/purpleidea/mgmt/engine"
 	"github.com/purpleidea/mgmt/pgraph"
 	"github.com/purpleidea/mgmt/util"
-
-	errwrap "github.com/pkg/errors"
+	"github.com/purpleidea/mgmt/util/errwrap"
 )
 
 // State stores some state about the resource it is mapped to.

engine/graph/vardir.go

@@ -22,7 +22,7 @@ import (
 	"os"
 	"path"
 
-	errwrap "github.com/pkg/errors"
+	"github.com/purpleidea/mgmt/util/errwrap"
 )
 
 // varDir returns the path to a working directory for the resource. It will try