[test] fix test_ensure_delay_when_tilde_in_custom_schedule

This commit relax constrains on possible test failure

    @staticmethod
    def test_ensure_delay_when_tilde_in_custom_schedule(mocker, capsys):
        svcname = "pytest"
        mocker.patch.dict(os.environ, {"OSVC_DETACHED": "1"})
        with capsys.disabled():
            assert Mgr()(argv=["-s", svcname, "create", "--kw", "status_schedule=~08:01-09:59"]) == 0
            assert Mgr()(argv=["-s", svcname, "print", "schedule"]) == 0
        next_runs = set()
        for i in range(4):
            assert Mgr()(argv=["-s", svcname, "print", "schedule", "--local", "--format", "json"]) == 0
            action = get_action(json.loads(capsys.readouterr().out), "status")
            next_runs.add(action["next_run"])
>       assert len(next_runs) > 3
E       assert 3 > 3
E        +  where 3 = len({1700042310.0, 1700042326.0, 1700042331.0})

opensvc/tests/commands/svc/test_schedule.py

@@ -66,11 +66,11 @@ def test_ensure_delay_when_tilde_in_custom_schedule(mocker, capsys):
             assert Mgr()(argv=["-s", svcname, "create", "--kw", "status_schedule=~08:01-09:59"]) == 0
             assert Mgr()(argv=["-s", svcname, "print", "schedule"]) == 0
         next_runs = set()
-        for i in range(4):
+        for i in range(6):
             assert Mgr()(argv=["-s", svcname, "print", "schedule", "--local", "--format", "json"]) == 0
             action = get_action(json.loads(capsys.readouterr().out), "status")
             next_runs.add(action["next_run"])
-        assert len(next_runs) > 3
+        assert len(next_runs) > 2, "'print schedule --local' called 6 times should propose at leat 2 != next_run"
 
     @staticmethod
     def test_ensure_next_run_is_fixed_when_no_tilde_in_custom_schedule(mocker, capsys):