feature #2468: use VERSION in onehost sync

* Only updates hosts with VERSION value < $REMOTES/VERSION
* Adds VERSION to the host when the update is correct
feature #2468: add probe to get remotes version
feature #2468: add --force option to onehost sync

Also prints the hosts selected for upgrade
feature #2468: Use only one queue for onehost sync

Also prints the percentage of hosts updated
feature #2468: add rsync option to onehost sync
feature #2468: fix bug getting probes version
Merge branch 'feature-2468'