Tidy up gettimeofday usage

Tidy up gettimeofday usage

The roken gettimeofday implementation doesn't return timezone
information. Audit the whole code to make sure that we don't rely on
this, and tidy up those places where we were passing an unused
timezone structure to the gettimeofday call.

Change-Id: Ia83f86483a9c7262fc0904236c0d039a912e3731
Reviewed-on: http://gerrit.openafs.org/4430
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>