test: flaky replication/on_schema_init.test.lua test

[avtikhon]

Tarantool version:
2.6.0-61-g5a9b79fa0

OS version:
OSX 14

Bug description:
Issue:

[001] --- replication/on_schema_init.result	Tue May 19 07:37:59 2020
[001] +++ replication/on_schema_init.reject	Thu Sep 10 18:48:07 2020
[001] @@ -97,7 +97,6 @@
[001]  test_engine:select{}
[001]  ---
[001]  - - [1]
[001] -  - [3]
[001]  ...
[001]  -- the space truly became local on replica
[001]  test_local:select{}

Steps to reproduce:

Optional (but very desirable):

• coredump
• backtrace
• netstat