We could be reading multiple messages from a socket buffer at once _without actually processing them yet_ which means that `fSuccessfullyConnected` might not be switched to `true` at the time we already parsed `VERACK` message and started to parse the next one. This is basically a false positive and we drop a legit node as a result even though the order of messages sent by this node was completely fine. To fix this I partially reverted dashpay#2790 (where the issue was initially introduced) and moved the logic for tracking the first message into ProcessMessage instead.

* commit '351fbf65efc9459cb69a3c843cc205a8b94c95b3': (987 commits)
  Update release-notes
  Bump nMinimumChainWork and defaultAssumeValid (dashpay#3336)
  Update release notes
  Try to actually accept newly created dstx-es into masternode's mempool (dashpay#3332)
  Switch CLIENT_VERSION_IS_RELEASE to `true` for v0.15 (dashpay#3306)
  Update release notes
  Bring back "about" menu icon (dashpay#3329)
  Add pubKeyOperator to `quorum info` rpc response (dashpay#3327)
  Update release-notes.md
  Update translations 2020-02-03 (dashpay#3322)
  Only sync mempool from v0.15+ (proto 70216+) nodes (dashpay#3321)
  Fix dark text on dark background in combobox dropdowns on windows (dashpay#3315)
  Fix node protection logic false positives (dashpay#3314)
  Merge bitcoin#13162: [net] Don't incorrectly log that REJECT messages are unknown.
  More of 13946
  Merge bitcoin#13946: p2p: Clarify control flow in ProcessMessage
  Add `automake` package to dash-win-signer's packages list (dashpay#3307)
  [Trivial] Release note update (dashpay#3308)
  Update release-notes.md
  Fix CActiveMasternodeManager::GetLocalAddress to prefer IPv4 if multiple local addresses are known (dashpay#3304)
  ...

# Conflicts:
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We could be reading multiple messages from a socket buffer at once _without actually processing them yet_ which means that `fSuccessfullyConnected` might not be switched to `true` at the time we already parsed `VERACK` message and started to parse the next one. This is basically a false positive and we drop a legit node as a result even though the order of messages sent by this node was completely fine. To fix this I partially reverted dashpay#2790 (where the issue was initially introduced) and moved the logic for tracking the first message into ProcessMessage instead.

Signed-off-by: cevap <dev@i2pmail.org>