ITS: log sync latency in test_exposure.py

Also:
  Clarify TOL is - only
  Use request/results instead of test/results to clarify:
    e_test, s_test --> e_req, s_req

bug: 186198638
Change-Id: I14a8ccc6270600cf6930c46afbdd55dc1b1c77e1
1 file changed