Improve MainDb::loadChatRooms by using a std::map instead of an std::list

Increase timeout of Michelle's and focus's chat room deletion

function simple_conference_base: wait for full state and then
liblinphone tester timeout ms before checking volumes

video_call_expected_fps_for_specified_bandwidth: increase number of
iterations

liblinphone @ 050f3ebf

-Subproject commit a495765262e44ba8b6a763819793bce2a5027d2c
+Subproject commit 050f3ebf4cba550664cd9f0ccebc4ffb9e828a9d