windows: More defensive code for windows VirtIO handling
windows: More defensive code for windows VirtIO handling

To avoid continous exceptions to eat 100% of the CPU we're
now sleeping at least for 1 second after an exception and
we're logging the exception in debug mode, so we can investigate
potential problems.
To avoid spamming the logs this is on debug log for now.

Change-Id: I0cb7c1108a579bf55f9340cb1c211b65d6cd8f5b
Bug-Url: https://bugzilla.redhat.com/1257835
Signed-off-by: Vinzenz Feenstra <600e8a10eeff4f08c65e2cf493cd851025e86fd2@redhat.com>

oVirt/ovirt-guest-agent,oVirt/ovirt-guest-agent,oVirt/ovirt-guest-agent,oVirt/ovirt-guest-agent