winverbs/nd: do not convert timeout status value

winverbs/nd: do not convert timeout status value

wv_io_timeout is an error value, but nd_timeout is a
success value.  This means that an overlapped request
can be completed in error, but GetOverlappedResult can
return a success value.  Instead, if a timeout is fatal,
report the status as wv_io_timeout, but if the timeout
can be retried, then report the status as wv_timeout.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
git-svn-id: svn://openib.tc.cornell.edu/gen1/trunk@2763 ad392aa1-c5ef-ae45-8dd8-e69d62a5ef86