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replication: rebootstrap instance on startup if it fell behind

If a replica fell too much behind its peers in the cluster and xlog
files needed for it to get up to speed have been removed, it won't be
able to proceed without rebootstrap. This patch makes the recovery
procedure detect such cases and initiate rebootstrap procedure if
necessary.

Note, rebootstrap is currently only supported by memtx engine. If there
are vinyl spaces on the replica, rebootstrap will fail. This is fixed by
the following patches.

Part of #461

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