Bug fixes:
- Upgrade jsonrpc to v1.3.0 and add epoll flags to MHD methods (#2633)
- Add logs to make db issues verbose and increase open files setting (#2631)
- Fix Nonce 0 issue after VC after a vacous epoch (#2627)
- Handle pows received before POW_SUBMISSION state (#2629)
- Avoid seed node to rejoin twice for responses (#2637)