The poller test recorded every initial deadline as the same start time
plus the delay, while the poller reads the clock at each arm call; when
arming the 2,000 timers took over 1 ms, the recorded order could differ
from the delivered one by more than the assertion's slack. Each deadline
now counts from the time read just before its scrp_timer_arm call, as
the re-arm loop's do, and a 3 ms pause halfway through arming keeps the
test exercising that case.
Chris Tate
56149fde04