* DHCP snooper: use coarse time to avoid clock_gettime() overhead
* Introduce uncertainty duration and subtract it from total lease time
* Update coarse time after we've performed the waiting
* Use coarsetime::Updater to update time even when deep inside event loop
* No need for manual coarsetime::Instant::update() anymore
* Ensure that coarsetime::Updater is stopped on Proxy::shutdown()
* Revert "Ensure that coarsetime::Updater is stopped on Proxy::shutdown()"
This reverts commit de255f4240.
* Revert "Use coarsetime::Updater to update time even when deep inside event loop"
This reverts commit 6a95272dcf.
* Revert "No need for manual coarsetime::Instant::update() anymore"
This reverts commit 9ffa829add.
* Update coarse time for the DHCP snooper after reading packet(s)
Fedor Korotkov
Nikolay Edigaryev