185999014 - Fix single process simulator

[iduartgomez]

• Fixes to simulated network implementation so it works correctly.
• Now simulated network noise can be turned off per simulation. (Noise implementation has some errors that will be tackled in other PR.)
• Fixed multiple errors in the op implementations (join ring, which now is connect).
• Improved and fixed the event log (was necessary so checks can be done correctly on tests).
• Added some missing todos functionality.
• Handle concurrent messages for a single transaction gracefully.
• Some preliminary work to takle #184207118, this fixed some of the issues with the ops.

[CLAassistant]

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