Better unknown messages for centreon_vmware_connector_client.pl

[hecko]

It would be much appreciated to have better unknown error message for users to be able to debug the state of the check with this proxy.

This:

centreon_vmware_connector_client.pl --plugin=apps::vmware::connector::plugin --mode=countvm-host ...

Could yield

UNKNOWN: Cannot get response (timeout received)

Now, I believe this is not very clear whether this is timeout received from plugin to centreon-vmware proxy, or from centreon-vmware proxy to actual esx / vcenter connection.

I suggest to change the message to:

UNKNOWN: Cannot get response (timeout received) - make sure centreon-vmware is running on x.x.x.x port xxx