Release mdadm-4.5

Hi all

I'm glad to announce mdadm-4.5. It is published to both remotes
(github and kernel.org). Here are some highlights from CHANGELOG.md.

# Release [mdadm-4.5](https://git.kernel.org/pub/scm/utils/mdadm/mdadm.git/log/?h=mdadm-4.5)

Features:
- Supports --logical-block-size in --create from Wu Guanghao
- Create array with sync del gendisk mode from Xiao Ni
- Update raid6check man page from Mingye Wang
- Re-enable mdadm --monitor ... for /dev/mdX from Dr. Joachim Schneider
- Use MAILFROM to set sendmail envelope sender address in mdmon from
Martin Wilck
- Don't stop array after creating it during assemble from Xiao Ni
- Use kernel raid headers from Mariusz Tkaczyk
- Allow RAID0 to be created with v0.90 metadata from NeilBrown
- Optimize DDF header search for widely used RAID controllers from lilinzhe
- Persist properties of MD devices after switch_root from Antonio Alvarez Feijoo
- Refactor continue_via_systemd() to make it more readable from Mateusz Kusiak
- Remove --freeze-reshape logic in reshape from Mateusz Kusiak
- Simplify remove logic in Incremental from Mariusz Tkaczyk

Fixes:
- Fix crash with homehost=none in super1 from Martin Wilck
- Moves memory management into Assemble to avoid null pointer
dereference from Xiao Ni
- Wait a while before removing a member in Incremental from Xiao Ni
- Some memleak issues from Wu Guanghao
- Fix memleak in udev from Mariusz Tkaczyk
- Support non-absolute name during monitor scan from QRPp
- Mdcheck fix and improvment from Martin Wilck
- Remove POSIX check for name from Mariusz Tkaczyk
- Enable udev block for Incremental/Assemble to avoid race condition
from Nigel Croxon
- Fix buiding errors from Xiao Ni
- Use standard libc nftw from Xiao Ni
- Allow any valid minor number in md device name from Martin Wilck
- Fix RAID0 to RAID10 migration for imsm array from Blazej Kucman
- Don't set badblock flag when adding a new disk from Wu Guanghao
- Regression tests fix from Xiao Ni
- Fix metadata corruption when managing new imsm array from Junxiao Bi
- Add update_super in ddf to prevent crash when assembling ddf array
from lilinzhe
- Disable legacy option ROM scan on UEFI machines for imsm array from
Ross Lagerwall
- Add sbin path to env PATH to avoid command modprobe can't be found
from Coly Li
- Add xmalloc.h to raid6check.c to fix building error from Xiao Ni
- Do not start reshape before switchroot from Mateusz Kusiak

Best Regards
Xiao