test: flaky box-luatest/gh_7743_term_initial_cfg_snap_test.lua

[NickVolynkin]

Test https://github.com/tarantool/tarantool/blob/master/test/box-luatest/gh_7743_term_initial_cfg_snap_test.lua is flaky

Introduced in tarantool/tarantool#8016, issue tarantool/tarantool#7743

[043] box-luatest/gh_7743_term_initial_cfg_snap_test>                 [ fail ]
[043] Test failed! Output from reject file /tmp/t/rejects/box-luatest/gh_7743_term_initial_cfg_snap.reject:
[043] Tarantool version is 2.11.0-entrypoint-794-g2574ff1a8
[043] TAP version 13
[043] 1..1
[043] # Started on Tue Dec 13 11:45:06 2022
[043] # Starting group: gh-7743
[043] not ok 1  gh-7743.test_sigterm_during_initial_snapshot
[043] #   .../test/box-luatest/gh_7743_term_initial_cfg_snap_test.lua:39: could not open
[043] #   stack traceback:
[043] #     .../test/box-luatest/gh_7743_term_initial_cfg_snap_test.lua:39: in function 'retrying'
[043] #     .../test/box-luatest/gh_7743_term_initial_cfg_snap_test.lua:36: in function 'gh-7743.test_sigterm_during_initial_snapshot'
[043] #     ...
[043] #     [C]: in function 'xpcall'
[043] # Ran 1 tests in 5.835 seconds, 0 succeeded, 1 errored
[043] Test "box-luatest/gh_7743_term_initial_cfg_snap_test.lua", conf: "None"
[043]   failed, rerunning ...

See https://github.com/tarantool/tarantool/actions/runs/3684840349

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