xstat: cope with different size timeval structures

xstat: cope with different size timeval structures

In xstat_fs_test and afsmonitor, try to display the xstat data
from the fileserver even if the fileserver has differently sized
timeval structures, or different word ordering, as the xstat
client program.

Change-Id: I16f32b25f0017cdcf5e41e583eeb129469c3aeb0
Reviewed-on: http://gerrit.openafs.org/2986
Tested-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>