Update gomod and vendor

vendor/github.com/moby/sys/mount/flags_bsd.go

@@ -0,0 +1,45 @@
+// +build freebsd openbsd
+
+package mount
+
+import "golang.org/x/sys/unix"
+
+const (
+	// RDONLY will mount the filesystem as read-only.
+	RDONLY = unix.MNT_RDONLY
+
+	// NOSUID will not allow set-user-identifier or set-group-identifier bits to
+	// take effect.
+	NOSUID = unix.MNT_NOSUID
+
+	// NOEXEC will not allow execution of any binaries on the mounted file system.
+	NOEXEC = unix.MNT_NOEXEC
+
+	// SYNCHRONOUS will allow any I/O to the file system to be done synchronously.
+	SYNCHRONOUS = unix.MNT_SYNCHRONOUS
+
+	// NOATIME will not update the file access time when reading from a file.
+	NOATIME = unix.MNT_NOATIME
+)
+
+// These flags are unsupported.
+const (
+	BIND        = 0
+	DIRSYNC     = 0
+	MANDLOCK    = 0
+	NODEV       = 0
+	NODIRATIME  = 0
+	UNBINDABLE  = 0
+	RUNBINDABLE = 0
+	PRIVATE     = 0
+	RPRIVATE    = 0
+	SHARED      = 0
+	RSHARED     = 0
+	SLAVE       = 0
+	RSLAVE      = 0
+	RBIND       = 0
+	RELATIME    = 0
+	REMOUNT     = 0
+	STRICTATIME = 0
+	mntDetach   = 0
+)