pkg/longpath: remove // import comments

These comments were added to enforce using the correct import path for
our packages ("github.com/docker/docker", not "github.com/moby/moby").
However, when working in go module mode (not GOPATH / vendor), they have
no effect, so their impact is limited.

Remove these imports in preparation of migrating our code to become an
actual go module.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

pkg/longpath/longpath.go

@@ -3,7 +3,7 @@
 //
 // Long paths are expected to be prepended with "\\?\" and followed by either a
 // drive letter, a UNC server\share, or a volume identifier.
-package longpath // import "github.com/docker/docker/pkg/longpath"
+package longpath
 
 import (
 	"os"

pkg/longpath/longpath_test.go

@@ -1,4 +1,4 @@
-package longpath // import "github.com/docker/docker/pkg/longpath"
+package longpath
 
 import (
 	"strings"