Remove apt preference.d local specific[skip ci].

etc/apt/preferences.d/backports

-# APT preferences for backports repositories.  -*- conf -*-
-#
-# Pin packages to priority 200, which will automatically upgrade installed
-# packages to the version from the repository if the installed version
-# is already from backports, but which won't replace installed packages
-# from regular repositories by default.
-Package: *
-Pin: release a=stretch-backports
-Pin-Priority: 200
-# Pull perl remctl module from backports.  Stanford server needs it.
-Package: libnet-remctl-perl
-Pin: release a=stretch-backports
-Pin-Priority: 995

etc/apt/preferences.d/cyrus-sasl

-# Make sure we get Cyrus SASL packages from the stretch-acs-test distribution.
-
-Package: sasl2-bin
-Pin: release a=stretch-acs-test
-Pin-Priority: 999
-
-Package: cyrus-sasl2-doc
-Pin: release a=stretch-acs-test
-Pin-Priority: 999
-
-Package: libsasl2-2
-Pin: release a=stretch-acs-test
-Pin-Priority: 999
-
-Package: libsasl2-modules
-Pin: release a=stretch-acs-test
-Pin-Priority: 999
-
-Package: libsasl2-modules-ldap
-Pin: release a=stretch-acs-test
-Pin-Priority: 999
-
-Package: libsasl2-modules-otp
-Pin: release a=stretch-acs-test
-Pin-Priority: 999
-
-Package: libsasl2-modules-sql
-Pin: release a=stretch-acs-test
-Pin-Priority: 999
-
-Package: libsasl2-modules-gssapi-mit
-Pin: release a=stretch-acs-test
-Pin-Priority: 999
-
-Package: libsasl2-dev
-Pin: release a=stretch-acs-test
-Pin-Priority: 999
-
-Package: libsasl2-modules-gssapi-heimdal
-Pin: release a=stretch-acs-test
-Pin-Priority: 999
-
-Package: cyrus-sasl2-dbg
-Pin: release a=stretch-acs-test
-Pin-Priority: 999
-
-Package: cyrus-sasl2-mit-dbg
-Pin: release a=stretch-acs-test
-Pin-Priority: 999
-
-Package: cyrus-sasl2-heimdal-dbg
-Pin: release a=stretch-acs-test
-Pin-Priority: 999

etc/apt/preferences.d/ldap

-# Make sure we get OpenLDAP packages from the stretch-openldap-test distribution.
-
-Package: slapd
-Pin: release a=stretch-openldap-test
-Pin-Priority: 999
-
-Package: slapd-smbk5pwd
-Pin: release a=stretch-openldap-test
-Pin-Priority: 999
-
-Package: ldap-utils
-Pin: release a=stretch-openldap-test
-Pin-Priority: 999
-
-Package: libldap-2.4-2
-Pin: release a=stretch-openldap-test
-Pin-Priority: 999
-
-Package: libldap2-dev
-Pin: release a=stretch-openldap-test
-Pin-Priority: 999
-
-Package: libldap-2.4-2-dbgsym
-Pin: release a=stretch-openldap-test
-Pin-Priority: 999
-
-Package: libnet-ldapapi-perl
-Pin: release a=stretch-openldap-test
-Pin-Priority: 999

etc/apt/sources.list.d/backports

-# APT configuration for backports repository.  -*- apt-sources -*-
-#
-# This file is empty for versions of Debian that haven't been released
-# yet, since the backports repository is created after release.
-
-deb     http://debian.stanford.edu/debian stretch-backports main non-free contrib
-deb-src http://debian.stanford.edu/debian stretch-backports main non-free contrib
-# APT configuration for Stanford-local repositories.  -*- apt-sources -*-
-
-# The Stanford-specific Debian archive and source tree (world-accessible).
-deb     http://debian.stanford.edu/debian-stanford stretch main non-free contrib
-deb-src http://debian.stanford.edu/debian-stanford stretch main non-free contrib
-
-# The Stanford restricted Debian archive and source tree.
-deb     http://debian.stanford.edu/debian-local stretch main non-free contrib
-deb-src http://debian.stanford.edu/debian-local stretch main non-free contrib
-# Managed by Puppet: DO NOT EDIT!
-
-# Special sources.list.d file for OpenLDAP and Cyrus SASL
-deb     http://debian.stanford.edu/debian-stanford stretch-acs-test main non-free contrib
-deb-src http://debian.stanford.edu/debian-stanford stretch-acs-test main non-free contrib

etc/apt/sources.list.d/stanford.list

-deb http://debian.stanford.edu/debian-stanford/ stretch main contrib non-free

etc/apt/sources.list.d/stanfordlocal.list

-# deb     http://debian.stanford.edu/debian-local stretch-ldap main non-free contrib
-# deb-src http://debian.stanford.edu/debian-local stretch-ldap main non-free contrib
-# deb     http://debian.stanford.edu/debian-local stretch main non-free contrib
-# deb-src http://debian.stanford.edu/debian-local stretch main non-free contrib
-
-# Get the openldap and cyrus-sasl2 packages that are specially built for Stanford
-# from the stretch-acs-prod distribution in the "stanford" archive.
-
-# NOTE! You will need to change this to "stretch-acs-prod" once you move
-# the base container from jessie to stretch.
-
-deb http://debian.stanford.edu/debian-stanford stretch-acs-test main non-free contrib
-deb-src http://debian.stanford.edu/debian-stanford stretch-acs-test main non-free contrib
-
-# Special sources.list.d file for OpenLDAP
-deb     http://debian.stanford.edu/debian-stanford stretch-openldap-test main non-free contrib
-deb-src http://debian.stanford.edu/debian-stanford stretch-openldap-test main non-free contrib