install_prereq: Install aptitude non-interactively

Currently aptitude is installed using interactive mode. This patch
changes this to use the non-interactive mode as it can block
automatic dependencies installation, ex: CI, Docker build.

ASTERISK-28726 #close

Change-Id: I271ee00d230513a6f044810351a32d83b2181133
(cherry picked from commit 0c02d0a4)