split each step more clearly

This reverts commit 5b8ed68c.

still haven't quite figured out how keys actually get to the puppet
server yet.

root@bungei:~# df -h
Sys. de fichiers                    Taille Utilisé Dispo Uti% Monté sur
udev                                   63G       0   63G   0% /dev
tmpfs                                  13G    1,3G   12G  11% /run
/dev/mapper/croot                      20G    2,9G   16G  16% /
tmpfs                                  63G     72K   63G   1% /dev/shm
tmpfs                                 5,0M       0  5,0M   0% /run/lock
tmpfs                                  63G       0   63G   0% /sys/fs/cgroup
tmpfs                                 4,0G       0  4,0G   0% /tmp
/dev/md127                            488M    140M  319M  31% /boot
/dev/mapper/vg_bulk-backups--pg      1007G    854G  103G  90% /srv/backups/pg
/dev/mapper/vg_bulk-backups--bacula    26T     13T   13T  50% /srv/backups/bacula
tmpfs                                  13G       0   13G   0% /run/user/0
root@bungei:~# vgs
  VG      #PV #LV #SN Attr   VSize  VFree
  vg_bulk   1   2   0 wz--n- 72,60t 51,60t
root@bungei:~# lvs
  LV             VG      Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  backups-bacula vg_bulk -wi-ao---- 20,00t
  backups-pg     vg_bulk -wi-ao----  1,00t
root@bungei:~# lvextend vg_bulk/backups-bacula -L +10G
  Size of logical volume vg_bulk/backups-bacula changed from 20,00 TiB (5242880 extents) to <20,01 TiB (5245440 extents).
  Logical volume vg_bulk/backups-bacula successfully resized.
root@bungei:~# lvextend vg_bulk/backups-bacula -L -10G
  Size may not be negative.
  Invalid argument for --size: -10G
  Error during parsing of command line.
root@bungei:~# lvextend vg_bulk/backups-bacula -l 7864320
  Size of logical volume vg_bulk/backups-bacula changed from <20,01 TiB (5245440 extents) to 30,00 TiB (7864320 extents).
  Logical volume vg_bulk/backups-bacula successfully resized.
root@bungei:~# resize2fs -p /dev/mapper/vg_bulk-backups--bacula
resize2fs 1.44.5 (15-Dec-2018)
Filesystem at /dev/mapper/vg_bulk-backups--bacula is mounted on /srv/backups/bacula; on-line resizing required
old_desc_blocks = 2560, new_desc_blocks = 3840
The filesystem on /dev/mapper/vg_bulk-backups--bacula is now 8053063680 (4k) blocks long.

root@bungei:~# df -h
Sys. de fichiers                    Taille Utilisé Dispo Uti% Monté sur
udev                                   63G       0   63G   0% /dev
tmpfs                                  13G    1,3G   12G  11% /run
/dev/mapper/croot                      20G    2,9G   16G  16% /
tmpfs                                  63G     72K   63G   1% /dev/shm
tmpfs                                 5,0M       0  5,0M   0% /run/lock
tmpfs                                  63G       0   63G   0% /sys/fs/cgroup
tmpfs                                 4,0G       0  4,0G   0% /tmp
/dev/md127                            488M    140M  319M  31% /boot
/dev/mapper/vg_bulk-backups--pg      1007G    854G  103G  90% /srv/backups/pg
/dev/mapper/vg_bulk-backups--bacula    30T     13T   17T  43% /srv/backups/bacula
tmpfs                                  13G       0   13G   0% /run/user/0
tmpfs                                  13G       0   13G   0% /run/user/1529

... and of course I grew the wrong filesystem (bacula instead of
pg)... sigh.

This is so that we can have different procedure for older and newer filesystems