Failsafes to prevent a consensus round from taking too long

Builds/levelization/results/ordering.txt

@@ -42,6 +42,7 @@ test.consensus > xrpl.basics
 test.consensus > xrpld.app
 test.consensus > xrpld.consensus
 test.consensus > xrpld.ledger
+test.consensus > xrpl.json
 test.core > test.jtx
 test.core > test.toplevel
 test.core > test.unit_test

docs/consensus.md

@@ -558,7 +558,7 @@ struct ConsensusResult
     ConsensusTimer roundTime;
 
     // Indicates state in which consensus ended.  Once in the accept phase
-    // will be either Yes or MovedOn
+    // will be either Yes or MovedOn or Expired
     ConsensusState state = ConsensusState::No;
 };