[Build] remove duplicate code from dockers cleanup code

[kv-y]

Why I did it

We use a script post_run_cleanup from sonic-build-hooks to cleanup all docker containers (except sonic-slave-xxx-user). So we can remove unneeded cleanup code from Dockerfile.j2 templates.

How I did it

Run

apt-get -s clean -y
apt-get -s autoclean -y
apt-get -s autoremove -y

in post_run_cleanup without -s flag (this flag means dry run)
and remove apt cleanup code from Dockerfile templates.

[kv-y]

It seems we still need to do apt cleanup before post_run_buildiinfo.
Otherwise we will collect info about additional deb packages that removed via apt-get autoremove.