vppinfra: write up clib_time_t
vppinfra: write up clib_time_t

Describe the clock rate adjustment algorithm in detail

Type: docs

Signed-off-by: Dave Barach <bfcdf3e6ca6cef45543bfbb57509c92aec9a39fb@barachs.net>
Change-Id: I5bcab18efafe05cd1db9a4b01ce6a6ba66e383fa

chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp