Include extension for shim binary format on Windows

Use full name including extension for shim binary format on Windows in order to
match any stat path faster without a fallback.

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

runtime/v2/shim/util.go

@@ -31,8 +31,6 @@ import (
 	"github.com/pkg/errors"
 )
 
-const shimBinaryFormat = "containerd-shim-%s-%s"
-
 var runtimePaths sync.Map
 
 // Command returns the shim command with the provided args and configuration

runtime/v2/shim/util_unix.go

@@ -31,6 +31,8 @@ import (
 	"github.com/pkg/errors"
 )
 
+const shimBinaryFormat = "containerd-shim-%s-%s"
+
 func getSysProcAttr() *syscall.SysProcAttr {
 	return &syscall.SysProcAttr{
 		Setpgid: true,

runtime/v2/shim/util_windows.go

@@ -29,6 +29,8 @@ import (
 	"github.com/pkg/errors"
 )
 
+const shimBinaryFormat = "containerd-shim-%s-%s.exe"
+
 func getSysProcAttr() *syscall.SysProcAttr {
 	return nil
 }