Revendor github.com/Microsoft/hcsshim

1. Revendors github.com/Microsoft/hcsshim to the latest known good commit.
This includes numerous bug fixes and improvements.

2. Vendors indirect dependency on go.opencensus.io since hcsshim now uses trace
correlation.

Signed-off-by: Justin Terry (VM) <juterry@microsoft.com>

vendor/github.com/Microsoft/hcsshim/internal/wclayer/layerid.go

@@ -3,7 +3,7 @@ package wclayer
 import (
 	"path/filepath"
 
-	"github.com/Microsoft/hcsshim/internal/guid"
+	"github.com/Microsoft/go-winio/pkg/guid"
 )
 
 // LayerID returns the layer ID of a layer on disk.

vendor/github.com/Microsoft/hcsshim/internal/wclayer/layerutils.go

@@ -6,7 +6,7 @@ package wclayer
 import (
 	"syscall"
 
-	"github.com/Microsoft/hcsshim/internal/guid"
+	"github.com/Microsoft/go-winio/pkg/guid"
 	"github.com/sirupsen/logrus"
 )
 

vendor/github.com/Microsoft/hcsshim/internal/wclayer/nametoguid.go

@@ -1,7 +1,7 @@
 package wclayer
 
 import (
-	"github.com/Microsoft/hcsshim/internal/guid"
+	"github.com/Microsoft/go-winio/pkg/guid"
 	"github.com/Microsoft/hcsshim/internal/hcserror"
 	"github.com/sirupsen/logrus"
 )

vendor/github.com/Microsoft/hcsshim/internal/wclayer/wclayer.go

@@ -1,6 +1,6 @@
 package wclayer
 
-import "github.com/Microsoft/hcsshim/internal/guid"
+import "github.com/Microsoft/go-winio/pkg/guid"
 
 //go:generate go run ../../mksyscall_windows.go -output zsyscall_windows.go wclayer.go