Get exact build start/stop times from the remote

Dependencies

• [2] EPWEMRI2 Allow determinism checking for entire jobsets
• [*] 5AIYUMTB Basic remote building

Change contents

• edit in src/hydra-queue-runner/build-remote.cc at line 302
  [2.427]

  [2.427]
  + auto start = readInt(from);

  + auto stop = readInt(from);

  + if (start && start) {

  + /* Note: this represents the duration of a single

  + round, rather than all rounds. */

  + result.startTime = start;

  + result.stopTime = stop;

  + }