test: simplify check of error message from getaddrinfo()

getaddrinfo() is a POSIX function that returns addrinfo structure in
success and error value for the failure.POSIX standard [1]
describes possible error values but description have a status of
recommendation. When non-existent hostname is passed to getaddrinfo() it
fails with error, but error value may be different on Linux and FreeBSD.
We have testcases where we check error messages obtained from
getaddinfo() ignoring this fact and sometime test fails on FreeBSD [2].

1. https://pubs.opengroup.org/onlinepubs/9699919799/functions/freeaddrinfo.html
2. https://github.com/tarantool/tarantool/runs/2107188391

Part of #5652