Tests pendingUnlockAmount and totalAmountLocked (#141)

* test pendingUnlockAmount and totalAmountLocked for scenario 1, 2 and 3

* refactors: defines verify_pendingUnlockAmountAndTotalAmountLocked

* refactors: renames verify_pendingUnlockAmountAndTotalAmountLocked to checkConsistencyPendingUnlockDailyUnlocked

* adds getLargestExpiryDate and consumes it

* test_scenario1_pendingUnlockAmount consumes getLargestExpiryDate

* updates: checkConsistencyPendingUnlockDailyUnlocked to use lastTrsDate instead of todayDay

* adds checks for consistency of pendingUnlockAmounts and totalAmountLocked

* Removes length parameter from getLargestExpiryDate and checkConsistencyPendingUnlockDailyUnlocked

* asserts checkConsistencyPendingUnlockDailyUnlocked(lockIDs, getLargestExpiryDate(lockIDs)