Unwatch file when encountering a stale NFS handle. When an NFS file handle becomes stale (ie, file was removed), it was crashing beaver.  Need to just unwatch file.
Unwatch file when encountering a stale NFS handle.
When an NFS file handle becomes stale (ie, file was removed), it was
crashing beaver.  Need to just unwatch file.

timstoop/python-beaver,imacube/python-beaver,Open-Party/python-beaver,zuazo-forks/beaver,jlambert121/beaver,PierreF/beaver,Appdynamics/beaver,Open-Party/python-beaver,rajmarndi/python-beaver,davidmoravek/python-beaver,josegonzalez/python-beaver,doghrim/python-beaver,imacube/python-beaver,thomasalrin/beaver,PierreF/beaver,doghrim/python-beaver,zuazo-forks/beaver,davidmoravek/python-beaver,thomasalrin/beaver,python-beaver/python-beaver,rajmarndi/python-beaver,Appdynamics/beaver,timstoop/python-beaver,jlambert121/beaver,python-beaver/python-beaver,josegonzalez/python-beaver