Merge ~ltrager/ubuntu-seeds/+git/platform:maas_bootloaders into ~ubuntu-core-dev/ubuntu-seeds/+git/platform:groovy

[Lee Trager]

Add bootloaders required by MAAS

MAAS doesn't list bootloaders as a dependency. They are pulled from the archive and published on images.maas.io. Currently MAAS pulls from Bionic when I looked to change to Focal I noticed pxelinux was incorrectly moved into universe. Once this branch is approved I'll backport it to Focal.

[Dimitri John Ledkov (xnox)]

Merged into Focal, Groovy, Hirsute.

review: Approve

diff --git a/supported-maas b/supported-maas
index de46e0c..d750486 100644
--- a/supported-maas
+++ b/supported-maas
@@ -5,7 +5,14 @@ Staged Packages:
  * snmp                    # APC
  * wget                    # DLI
  * freeipmi-tools          # IPMI
+ * ipmitool                # IPMI
  * libvirt-clients         # Virsh
+ * pxelinux                # Booting legacy x86, PowerNV, Windows
+ * syslinux-common         # Booting legacy x86, PowerNV, Windows
+ * shim-signed             # Booting UEFI secure boot AMD64
+ * grub-efi-amd64-signed   # Booting UEFI AMD64
+ * grub-efi-arm64-bin      # Booting UEFI ARM64
+ * grub-ieee1275-bin       # Booting PPC64
  * archdetect-deb
  * avahi-utils
  * bind9