Merge "fs_mgr: use ro.persistent_properties.ready"

// acceptable overlayfs backing storage

const auto kOverlayMountPoint = "/cache"s;

// return true if everything is mounted, but before adb is started.  At

// 'trigger firmware_mounts_complete' after 'trigger load_persist_props_action'.

// Return true if everything is mounted, but before adb is started.  Right

// after 'trigger load_persist_props_action' is done.

bool fs_mgr_boot_completed() {

    return !android::base::GetProperty("ro.boottime.init", "").empty() &&

           !!access("/dev/.booting", F_OK);

    return android::base::GetBoolProperty("ro.persistent_properties.ready", false);

}

bool fs_mgr_is_dir(const std::string& path) {