console: fix :endswith() err in tntctl connection

There used to be a rare error when failed to connect via tarantoolctl to
listening cartridge console. It was caused by unclear
console.local_print() contract. Starting from gh-7031 fix, the function
assumed string-only arguments, while in some cases cdata error was
passed.

Now console.local_print() prints all non-string arguments as is, without
modifying potential local_eos.

Closes #8374

NO_DOC=bugfix
NO_TEST=very hard to test