Moved golang.org/x/net/context to context

commands/prepare.go

@@ -18,6 +18,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 package commands
 
 import (
+	"context"
 	"flag"
 	"os"
 	"path/filepath"
@@ -27,7 +28,6 @@ import (
 	"github.com/future-architect/vuls/scan"
 	"github.com/future-architect/vuls/util"
 	"github.com/google/subcommands"
-	"golang.org/x/net/context"
 )
 
 // PrepareCmd is Subcommand of host discovery mode