core: better excpetion logging of VdsExceptions

host details are missing in case of communication errors.

so instead of this (no host details at all:

 ERROR [org.ovirt.engine.core.vdsbroker.vdsbroker.GetCapabilitiesVDSCommand]
(DefaultQuartzScheduler_Worker-66) Command GetCapabilitiesVDS execution
failed. Exception: VDSNetworkException: java.net.SocketTimeoutException:
connect timed out

it will look like this:

ERROR
[org.ovirt.engine.core.vdsbroker.vdsbroker.GetCapabilitiesVDSCommand]
(DefaultQuartzScheduler_Worker-15) Command
GetCapabilitiesVDSCommand(HostName = local-bmw, HostId =
4ad3ef8c-ee35-4853-8e49-9637fcef45e1, vds=Host[local-bmw]) execution
failed. Exception: VDSNetworkException: java.net.SocketTimeoutException:
connect timed out

Change-Id: Iae20330e5761b844a6725d5e84aaa4d05e3db728
Signed-off-by: Roy Golan <rgolan@redhat.com>