builder: 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>

cli/command/image/build/internal/git/gitutils.go

@@ -1,4 +1,4 @@
-package git // import "github.com/docker/docker/builder/remotecontext/git"
+package git
 
 import (
 	"net/http"

cli/command/image/build/internal/git/gitutils_test.go

@@ -1,4 +1,4 @@
-package git // import "github.com/docker/docker/builder/remotecontext/git"
+package git
 
 import (
 	"bytes"

cli/command/image/build/internal/urlutil/urlutil.go

@@ -3,7 +3,7 @@
 //
 // This package is specifically written for use with docker build contexts, and
 // should not be used as a general-purpose utility.
-package urlutil // import "github.com/docker/docker/builder/remotecontext/urlutil"
+package urlutil
 
 import (
 	"strings"

cli/command/image/build/internal/urlutil/urlutil_test.go

@@ -1,4 +1,4 @@
-package urlutil // import "github.com/docker/docker/builder/remotecontext/urlutil"
+package urlutil
 
 import "testing"