Revert "Warn about any reference to /lib/init in init.d scripts"

It seems that adding this tag was a bit too early (see #710559).

This reverts commit dd0a448c2793a151c0bca09009b33a043aebd67c.

Conflicts:
	t/tests/files-bad-perm-owner/debian/debian/binary.init
	t/tests/init.d-lsb-headers/debian/debian/init.d-lsb-headers-missing.init
	t/tests/init.d-lsb-headers/debian/debian/init.d-lsb-headers-virtual.init