--tarantool-port is not documented

[kostja]

Option --tarantool-port is not documented - not in --help, not in readme.md

[Totktonada]

AFAIU, it is to run a core = tarantool (diff-based) test against tarantool that is run manually on a separate terminal.

It is supposed to work only for a single instance test.

I never used it, to be honest. However the feature can be useful for debugging.