Rename: cow/cowman -> storage/oci-storage

Rename the library module and CLI wrapper.
Rename daemon/graphdriver to drivers.
Catch up vendoring to match modules we've pruned.

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>

mflag/example/example.go

@@ -3,7 +3,7 @@ package main
 import (
 	"fmt"
 
-	flag "github.com/docker/docker/pkg/mflag"
+	flag "github.com/containers/storage/pkg/mflag"
 )
 
 var (

mflag/flag.go

@@ -9,7 +9,7 @@
 //	Define flags using flag.String(), Bool(), Int(), etc.
 //
 //	This declares an integer flag, -f or --flagname, stored in the pointer ip, with type *int.
-//		import "flag /github.com/docker/docker/pkg/mflag"
+//		import "flag /github.com/containers/storage/pkg/mflag"
 //		var ip = flag.Int([]string{"f", "-flagname"}, 1234, "help message for flagname")
 //	If you like, you can bind the flag to a variable using the Var() functions.
 //		var flagvar int
@@ -92,7 +92,7 @@ import (
 	"text/tabwriter"
 	"time"
 
-	"github.com/docker/docker/pkg/homedir"
+	"github.com/containers/storage/pkg/homedir"
 )
 
 // ErrHelp is the error returned if the flag -help is invoked but no such flag is defined.