LU-6245 libcfs: remove libcfs userland time abstraction

Instead of creating a time abstraction layer in libcfs
for userland lets just use the userland time APIs
directly.

Change-Id: I5c91b23d4ae6c4f75f7712c28572818f26fe57e2
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: http://review.whamcloud.com/19113
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Frank Zago <fzago@cray.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>