Fix dual-booting (#1250)

# Fixes

 * Optimized partition lookups
 * Fixed re-use of partition UUID's
 * `BlockDevice().get_partition()` now supports looking up both `PARTUUID` and `UUID` for a partition under itself
 * Partitions listed in `--disk-layout` that doesn't have a PARTUUID/UUID should no longer cause an exception, but instead logs a warning and they will simply be ignored
 * `Filesystem().add_partition()` now handles `DiskError` raised by `partition.part_uuid`
 * Fixed issue on normal partitions where the device was not properly frozen in `lambda` calls, meaning two or more mount-points shared the same `device_instance`.
 * Lowered global `DISK_RETRY_ATTEMPTS` to 5, as the timeouts are linear *(`range(DISK_RETRY_ATTEMPTS) * DISK_TIMEOUTS`)*

0 files changed, 0 insertions, 0 deletions