Release version 2.0.1

Merge pull request Derecho-Project#156 from Derecho-Project/config_re…

…start

According to the performance test using 'bandwidth_test,' the performance agrees with that before this pull request. And since nobody has given further comments on this. I confirmed this pull request.

Merge pull request Derecho-Project#156 from Derecho-Project/config_re…

…start

According to the performance test using 'bandwidth_test,' the performance agrees with that before this pull request. And since nobody has given further comments on this. I confirmed this pull request.

SOSP demo version

Refactored p2p_connections again. Much simpler structure.

Moved latency_test from archive to tests/performance_tests