Use Ctrl+C to discard the input in console

[TarantoolBot]

Product: Tarantool
Since: 2.10.0-beta2-168-ga8b3b267c
Audience/target: dev
Root document: https://www.tarantool.io/en/doc/latest/reference/interactive_console/
SME: @ locker

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.
Requested by @vr009 in tarantool/tarantool@a8b3b26.