Following https://abseil.io/tips/122 to make tests easier to understand
and adds a bit of flexibility to create sockets with custom parameters.
This also simplifies handover tests.
Additionally, AdvanceTime will now also run timers, as that was easily
forgotten previously.
Bug: None
Change-Id: Ieb5eece7aca51c98a7634ed1c61646383ad1712d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/253782
Reviewed-by: Sergey Sukhanov <sergeysu@webrtc.org>
Commit-Queue: Victor Boivie <boivie@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36141}
eee0e336a2