gui: ceph osd: improve version hints

gui: ceph osd: improve version hints

we now traverse the whole tree for the versions and save not only
the maxversion but if we have mixed versions at all

the traversal contains code to inject the host versions into the treenodes

this way we can omit any icon in case everything is on the same level
and if not we:

* show a check at update hosts and services
* show a 'restart' symbol for osds that only need a restart
* show an 'upgrade' symbol (fa-upload) for osds/hosts that need
  a package upgrade

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>