Add properties to ESX Host and ESX VM in discovery_runner

This can be used to select some VMs/Host by name

I needed this feature. As I coded it for my self, I submit it if someone else  may find it useful.

For exemple :

```
define discoveryrule {
       discoveryrule_name       CustomVMRule
       creation_type            host
       vmname                  ^LAB-
       +use                     lab-vm
}
```

I tried to add "istpl" and "isvmup"

check_esx3.pl doesn't give Template info

And I don't know if "isvmup" useful for discovery (maybe is some circumstances)