Test: Further stability improvements to ACL tests

* erase items before calling std::map::emplace in le_acl_facade
* add more logging to LE and classic ACL facades
* reduce GrpcEventQueue's wait time from 500ms to 100ms so that
  it can be terminated faster
* force a wait of 100ms after closing gRPC streams in Python

Bug: 228619929
Bug: 235872679
Bug: 232048916
Test: gd/cer/run --sl4a
Change-Id: Idbb12b55db96b00bb695c54af1fd0efcc1f65841