merge upstream/master
some adjustments and experimentation related with parent-child associations toward re-enabling hierarchy test
some clean-up and internal refactoring toward enabling hierarchy launch test
resource_monitor: in very first request, set from_time parameter to  a
 few  minutes ago maximum
change some logging from debug to trace
re-enable launch of platform hierarchy
merge upstream/master
merge upstream/master
start data subscriber for each platform
merge upstream/master
some more comments
test_platform_agent_with_rsn re-enabled! This was after a refactor of the platform integration test set-up (initially coded in test_platform_launch) so it can be used in other test files.
merge upstream/master
set appropriate 'driver_config' for PlatformAgentInstance object
more agent configuration alignment: use 'driver_config' entry.
Adds actor features and tests for actor compatibility

Actor functionality is verified in coi_pycc as well
merge upstream/master
Fixes NoneType not iterable bug
fixed nightly error. nan values for density was causing problems in the test
temporary trick so the UI platform command testing runs