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test: fix flaky tests when JIT is enabled

<box/net.box_reconnect_after_gh-3164.test.lua> and
<vinyl/tx_gap_lock.test.lua> checking some objects that should be
collected may fail because these objects are referenced as the upvalues
for a function inlined on some JIT trace. The objects aren't leaked;
tests don't consider the JIT semantics. See more details in [1].

This patch disables JIT for the first test.

The second test itself isn't affected since the commit
tarantool/test-run@33fbace83 ("Add
default server restart to each test run"). Because of this commit, the
`tx.gap_locks` can't be affected by the use of the `create_iterator()`
function in other tests.
But to avoid similar situations in the future, the JIT is disabled for
the `res.next()` function in test utils.

[1]: https://github.com/tarantool/tarantool/wiki/LuaJIT-function-inlining

Closes tarantool/tarantool-qa#233
Closes tarantool/tarantool-qa#276

NO_DOC=fix flaky test
NO_CHANGELOG=see NO_DOC

(cherry picked from commit 1a5e3bf3c)

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