Run worker-based engine tests faster

This change reduces polling intervals for transport and proxy
from default 1 second to 0.01 second. On my machine this reduces
time needed to run WorkerBasedEngineTest almost 5 times, which,
in turn, makes testr almost twice faster.

Change-Id: I8dfe08c06234f33e838059b2f8d9d6a7c7819e06
Merge "Run worker-based engine tests faster"