Release 21.1

Curtin release 21.1 is now available

The 21.1 release:
 * spanned about 4 months
 * had 9 contributors from 9 domains
 * fixed 13 Launchpad issues

Highlights:
  Improve support for FBA dasds, and ECKD dasds when passed via virtio-blk to KVM
  Fix bootloader installation when installing RHEL
  Support imsm external metadata RAID containers

== Changelog ==
 - This adds arm64 compatibility for RH installations [Mark Klein]
 - vmtest: add Hirsute release classes, tool to add vmtest class
   [Ryan Harper]
 - vmtest: fix image-sync after maas URL stream rename
   [Ryan Harper] (LP: #1908543)
 - storage_config: set ptable to vtoc for 'virt' dasds as well as 'ECKD'
   [Michael Hudson-Doyle]
 - install_grub: Fix bootloader-id for RHEL systems, must be redhat
   [Ryan Harper] (LP: #1906543)
 - vmtests: remove LP: #1888726 skip_by_date decorators
 - storage_config: only produce type: dasd actions for ECKD dasds
   [Michael Hudson-Doyle]
 - storage_config: handle some FBA dasd oddities [Michael Hudson-Doyle]
 - apt_config: stop using the deprecated apt-key command
   [Nishanth Aravamudan] (LP: #1892494)
 - allow adding a vtoc partition without a device id [Michael Hudson-Doyle]
 - simplify dasdview parsing code [Michael Hudson-Doyle]
 - fix construction of DasdPartitionTable from fdasd output
   [Michael Hudson-Doyle]
 - Don't install grub if it is already found on CentOS/RHEL
   [Lee Trager] (LP: #1895067)
 - vmtests: Replace newly added Eoan test with Groovy [Ryan Harper]
 - vmtests: test using a disk with RAID partition on it directly in a RAID
   [Michael Hudson-Doyle]
 - fix verification of vtoc partitions [Michael Hudson-Doyle] (LP: #1899471)
 - create an empty vtoc in disk_handler [Michael Hudson-Doyle]
 - remove unused parameters from dasd code [Michael Hudson-Doyle]
 - remove support for calling get_path_to_storage_volume on a dasd action
   [Michael Hudson-Doyle]
 - clear-holders: fix identification of multipath partitions
   [Ryan Harper] (LP: #1900900)
 - vmtests: remove skip_by_dates for now-fixed bcache issue
 - debian/rules: drop PKG_VERSION and UPSTREAM_VERSION [Paride Legovini]
 - deb packaging: fully cleanup directory tree after build
   [Paride Legovini] (LP: #1899698)
 - udevadm_info should use maxsplit=1 instead of maxsplit=2
   [Sergey Bykov] (LP: #1895021)
 - vmtests/multipath-lvm: dont assume device-mapper block names
   [Ryan Harper] (LP: #1898758)
 - vmtest: fix the groovy arm64 subarch [Paride Legovini] (LP: #1898757)
 - tools/curtainer: dearmor gpg key and use apt-key add
   [Ryan Harper] (LP: #1898609)
 - Support imsm external metadata RAID containers
   [Gyorgy Szombathelyi] (LP: #1893661)
 - Drop tools/new-upstream-snapshot [Paride Legovini]