flaky test test_vshard_bootstrap_enought_timeout

Sometimes 5 seconds is not enough for tt_cmd rs vs bootstrap --timeout 5 command to finalize.

⨯ failed to bootstrap vshard: [string "local function func(...) local ok, vshard = p..."]:1: {"replicaset":"storage-001","code":6,"type":"ShardingError","message":"Master is not configured for replicaset storage-001","name":"MISSING_MASTER"}

FAILED test/integration/replicaset/test_replicaset_vshard.py::test_vshard_bootstrap_enought_timeout - assert 1 == 0