Update to v2.3.0

Update to v2.3.0

keymap.diff: removing last hunk
It only removes spaces, upstream already did that when
adding an assertion to it.

pve-auth.diff & fairsched.diff:
 * dropped fairsched and moved vmid code to pve-auth.diff
 * adapt pve-auth.diff to new qemu option parsing

virtio-balloon-fix-query.patch:
 * merged ram_size -> get_current_ram_size() change

backup-modify-job-api.patch
 * move new bdrv_op_unblock(target) into target guard
 * fuzz/context fixup
 * added NULL target checks to new places where necessary
   (bdrv_op_is_blocked is now used on the target in
   backup_start)
 * annotated some hunks with their function
 * applied same backup_start fixup of qmp_drive_backup to
   the new qmp_blockdev_backup (introduced in c29c1dd3)

disable-efi-enable-pxe-roms.patch: fuzz/context fixup

virtio-balloon-dimmfix1.patch: is now upstream
virtio-balloon-dimmfix2.patch: is now upstream
virtio-balloon-dimmfix3.patch:
  merged into virtio-balloon-fix-query.patch
virtio-scsi_fix_assert.patch: is now upstream

backup-add-dir-format.patch,
backup-add-pve-monitor-commands.patch,
internal-snapshot-async.patch:
 * Convert bdrv_find to blk_by_name
   bdrv_find was dropped and the code now uses blk_by_name
   and blk_bs

internal-snapshot-async.patch:
 * fuzz/context fixups
 * added missing sysemu/block-backend.h for blk_by_name