Cephadm bootstrap sets incorrect user & group id for ceph user

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Hi,

I got this cluster setup on 3VMs for testing purposes. Every time one of the boxes rebooted the OSDs daemons failed.
They worked fine, as long as I didn't reboot....

Then I noticed that the UID and GID for the Ceph user were set incorrectly.
If I understand correctly: the `ceph) user needs to have a UID and GID set to 167.
In the Docker container this was correct, but on the host it was a different story.

The fix was quite easy of course:
$ usermod -u 167 ceph
$ groupmod -u 167 ceph

But the errors are not that clear (only found some reference about this in the OSD service log, see below).

If Ceph needs to have this user set to this specific ID. Maybe it would be nice to add this to the Troubleshooting section of the docs?

This is the output of the OSD service log (in case someone tries to search for this error):
`Aug 24 17:00:09 alpha0001 bash[7301]: debug 2021-08-24T17:00:09.133+0000 7f025ef4a080  0 set uid:gid to 167:167 (ceph:ceph)                                                                            
Aug 24 17:00:09 alpha0001 bash[7301]: debug 2021-08-24T17:00:09.133+0000 7f025ef4a080  0 ceph version 16.2.5 (0883bdea7337b95e4b611c768c0279868462204a) pacific (stable), process ceph-osd, pid 8      
Aug 24 17:00:09 alpha0001 bash[7301]: debug 2021-08-24T17:00:09.133+0000 7f025ef4a080  0 pidfile_write: ignore empty --pid-file                                                                        
Aug 24 17:00:09 alpha0001 bash[7301]: debug 2021-08-24T17:00:09.137+0000 7f025ef4a080  1 bdev(0x5646bc068800 /var/lib/ceph/osd/ceph-0/block) open path /var/lib/ceph/osd/ceph-0/block                  
Aug 24 17:00:09 alpha0001 bash[7301]: debug 2021-08-24T17:00:09.137+0000 7f025ef4a080  1 bdev(0x5646bc068800 /var/lib/ceph/osd/ceph-0/block) open size 214744170496 (0x31ffc00000, 200 GiB) block_size>
Aug 24 17:00:09 alpha0001 bash[7301]: debug 2021-08-24T17:00:09.137+0000 7f025ef4a080  1 bluestore(/var/lib/ceph/osd/ceph-0) _set_cache_sizes cache_size 1073741824 meta 0.45 kv 0.45 data 0.06        
Aug 24 17:00:09 alpha0001 bash[7301]: debug 2021-08-24T17:00:09.137+0000 7f025ef4a080  1 bdev(0x5646bc068c00 /var/lib/ceph/osd/ceph-0/block) open path /var/lib/ceph/osd/ceph-0/block                  
Aug 24 17:00:09 alpha0001 bash[7301]: debug 2021-08-24T17:00:09.137+0000 7f025ef4a080  1 bdev(0x5646bc068c00 /var/lib/ceph/osd/ceph-0/block) open size 214744170496 (0x31ffc00000, 200 GiB) block_size>
Aug 24 17:00:09 alpha0001 bash[7301]: debug 2021-08-24T17:00:09.137+0000 7f025ef4a080  1 bluefs add_block_device bdev 1 path /var/lib/ceph/osd/ceph-0/block size 200 GiB                           
Aug 24 17:00:09 alpha0001 bash[7301]: debug 2021-08-24T17:00:09.137+0000 7f025ef4a080  1 bdev(0x5646bc068c00 /var/lib/ceph/osd/ceph-0/block) close                                                    
Aug 24 17:00:09 alpha0001 bash[7301]: debug 2021-08-24T17:00:09.161+0000 7f025ef4a080  1 bdev(0x5646bc068800 /var/lib/ceph/osd/ceph-0/block) close                                                    
Aug 24 17:00:09 alpha0001 bash[7301]: debug 2021-08-24T17:00:09.425+0000 7f025ef4a080  0 starting osd.0 osd_data /var/lib/ceph/osd/ceph-0 /var/lib/ceph/osd/ceph-0/journal                            
Aug 24 17:00:09 alpha0001 bash[7301]: debug 2021-08-24T17:00:09.425+0000 7f025ef4a080 -1 Falling back to public interface                                                                              
Aug 24 17:00:09 alpha0001 bash[7301]: debug 2021-08-24T17:00:09.429+0000 7f025ef4a080  0 load: jerasure load: lrc load: isa                                                                            
Aug 24 17:00:09 alpha0001 bash[7301]: debug 2021-08-24T17:00:09.437+0000 7f025ef4a080  1 bdev(0x5646bc03c400 /var/lib/ceph/osd/ceph-0/block) open path /var/lib/ceph/osd/ceph-0/block                  
Aug 24 17:00:09 alpha0001 bash[7301]: debug 2021-08-24T17:00:09.437+0000 7f025ef4a080 -1 bdev(0x5646bc03c400 /var/lib/ceph/osd/ceph-0/block) open open got: (13) Permission denied  `
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