Lintian changed the format of overrides in an incompatible way
(see #1007002). This also adds a few extra overrides.

This ensures that adduser doesn't create /run/nslcd with permissions
from login.defs.

This also ensures that single character passwords are also retained.

This also adds the missing Pre-Depends to pynslcd, gets the manual pages
from the installation directory and ignores the default nslcd.conf that
gets installed.

Lintian no longer complains about the NSS plugin library that we ship.

This adds some fields and removes the Homepage field that is already in
debian/control.

- d/nslcd.if-up: Adjust script to make it compatible with
  networkd-dispatcher
- d/nslcd.links: Install the proper nslcd script inside the
  /usr/lib/networkd-dispatcher/routable.d/ directory (LP: #1718227)

Closes !2

If pynslcd.docs and pynslcd.examples are symlinks to the corresponding
nslcd files the nslcd files somehow end up becoming executable on Salsa
which confuses debhelper.

Change ca-certificates as dependency instead of recommends since initial
configuration uses certificates.

Closes #877002.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>