Bug fixes:
- Fix to avoid delay in switching to POW_SUBMISSION state (#2615)
- Remove check against IP for dscommitte in FinishRejoinAsDS (https://github.com/Zilliqa/Issues/issues/737)
- Fix dm7 (#2613)
- Remove storage of init trie in DB (#2622)
- Add VC9 test - Suspend before response (#2614)