Fix merger support recognition on tarantool 2.10+ #227
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We cannot use just string comparison as before, because '2.10.0-<...>'
less than, say, '2.3' lexicographically. The module had to use the old
select implementation on tarantool 2.10 due to this problem.
Implemented more accurate checks, whether built-in and external
tuple-merger are supported. Say, it'll not enable the built-in merger on
tarantool 2.4.1, where the module has a known problem (see comments in
the code).
Fixed the problem of the same kind in a test case.