Add bank workload #74
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In [1] new transaction manager has been added that implements MVCC support. Without concurrency control, if someone is reading from a database at the same time as someone else is writing to it, it is possible that the reader will see a half-written or inconsistent piece of data. In the bank test, we create a pool of simulated bank accounts, and transfer money between them using transactions which read two randomly selected accounts, subtract and increment their balances accordingly, and write the new account values back. Under snapshot isolation, the total of all accounts should be constant over time. We read the state of all accounts concurrently, and check for changes in the total, which suggests read skew or other snapshot isolation anomalies. There are two kind of test: first one stores bank accounts in a single space and second one stores each bank account in a separate space. Original version of tests were used only SQL commands to manipulate accounts but `transfer` operation requires using transactions which are not supported in Tarantool [2]. So second version of tests has been added where sequences of SQL commands required atomicity were replaced by Lua functions `_WITHDRAW` and `_WITHDRAW_MULTITABLE`. 1. tarantool/tarantool#4897 2. tarantool/tarantool-java#63 Closes #67
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Closes #67