daemon-interactive: do not allow clearing the prompt
daemon-interactive: do not allow clearing the prompt

Typing somthing and then hitting backspace multiple-times would clear
the prompt previously.

This patch do not let backspace clear the prompt msg.

Signed-off-by: Prasanna Kumar Kalever <a78d8f98557446023f5b3ba9944d7be259a978a3@redhat.com>

agrover/targetcli-fb