Find how to reduce unix socket path length

[Gerold103]

For a lot of replication tests I get "No buffer space available" error. Path I have is not so long really, but the path added by test-run is quite big. Here is an example: unix/:/Users/gerold/Work/Repositories/tarantool/test/var/010_replication/replica-applier-rollback.socket-admin. This exceeds 108 bytes path limit (there is 110 symbols). Maybe we at least could stop adding script name to the socket name, or make socket-admin part shorter somehow.

[Totktonada]

However we can do some tricks: say, chdir into a directory and fill sun_path with just name w/o a full path. It works at least on Linux. This looks weird, however will be helpful in some cases.

tarantool/tarantool#4634

[Gerold103]

That is getting worse - when run tests from ee, it adds tarantool-ee/ into the path making it even longer. As a result, I get this warning:

WARGING: unix sockets can become longer than 107 symbols:
WARNING: for example: "/Users/gerold/Work/Repositories/tarantool-ee/tarantool/test/var/???_replication/autobootstrap_guest3.control" has length 108