tarantool / tarantool / 12752

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travis-ci

recovery: make LSN gap check more thorough

Currently, the lsn gap check is rather sloppy: when we open an xlog file
for recovery, we check that its vclock equals the vclock of the last
replayed row (see recover_remaining_wals), so if there were WAL write
errors at the end of an xlog file, we will report a false-positive gap
error (because wal doesn't rollback lsn counter). Let's use PrevVclock
xlog meta key introduced earlier to improve the check.

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