Tarantool console quits if you type Ctrl+C.
This patch fixes console behavior on sending SIGINT.
Console discards the current input on typing Ctrl+C
and invites user to the new line.

In daemon mode the process will exit after receiving SIGINT.

Test gh-2717 should be skipped on release build, cause it
uses error injection which is enabled only on debug mode.

Fixes #2717

@TarantoolBot document
Title: Use Ctrl+C to discard the input in console

The signal SIGINT discards the input in console mode.
When tarantool executes with -e flag or runs as a daemon, SIGINT
kills the process and tarantool complains about it in log.