Merge "fs_mgr: use "-T now" for tune2fs" am: 7ef2b1d8 am: f8f993ad am:...

    // requires to give last_fsck_time to current to avoid insane time.

    // otherwise, tune2fs won't enable metadata_csum.

    std::string now = std::to_string(time(0));

    const char* tune2fs_args[] = {TUNE2FS_BIN, "-O",        "metadata_csum,64bit,extent",

                                  "-T",        now.c_str(), blk_device.c_str()};

                                  "-T",        "now", blk_device.c_str()};

    const char* resize2fs_args[] = {RESIZE2FS_BIN, "-b", blk_device.c_str()};

    if (!run_command(tune2fs_args, ARRAY_SIZE(tune2fs_args))) {