Add vendoring to containerd master

Initial vendor list validated with empty $GOPATH
and only master checked out; followed by `make`
and verified that all binaries build properly.
Updates require github.com/LK4D4/vndr tool.

Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com>

vendor/github.com/stevvooe/go-btrfs/ioctl.go

@@ -0,0 +1,11 @@
+package btrfs
+
+import "syscall"
+
+func ioctl(fd, request, args uintptr) error {
+	_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, fd, request, args)
+	if errno != 0 {
+		return errno
+	}
+	return nil
+}