message: [0.14.0.x] Remove check for mempool size in CInstantSendManager::CheckCanLock
  * Remove check for mempool size in CInstantSendManager::CheckCanLock
  This should not have been here at all and is already removed in develop.
  Recent InstantSend failures on mainnet were partly related to this check.
  * Skip autois tests for new IS system
diff: @@ -459,10 +459,6 @@ bool CInstantSendManager::ProcessTx(const CTransaction& tx, const Consensus::Par
  bool CInstantSendManager::CheckCanLock(const CTransaction& tx, bool printDebug, const Consensus::Params& params)
  {
  - if (sporkManager.IsSporkActive(SPORK_16_INSTANTSEND_AUTOLOCKS) && (mempool.UsedMemoryShare() > CInstantSend::AUTO_IX_MEMPOOL_THRESHOLD)) {
  - return false;
  - }
  -
  if (tx.vin.empty()) {
  // can't lock TXs without inputs (e.g. quorum commitments)
  return false;
  