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vinyl: fix broken rollback to savepoint

Now vinyl's rollback to TX savepoint doesn't work in case when one
TX has several statements modifying the same key.

A simple example is presented in gh ticket 2589.

Fix it.

Add a big test that compares vinyl with memtx in case of many
failing (catched with pcall) statements done in a transaction.

Fixes #2589

6 of 6 new or added lines in 1 file covered. (100.0%)

29703 of 34426 relevant lines covered (86.28%)

1116735.43 hits per line