configure.ac: Install dbus policy in /usr/share, not /etc From https://bugs.debian.org/1006631:
> dbus supports policy files in both `/usr/share/dbus-1/system.d` and > `/etc/dbus-1/systemd`. [The] recently released dbus 1.14.0, officially > deprecates installing packages' default policies into `/etc/dbus-1/systemd`, > instead reserving it for the sysadmin. This is the same idea as the > difference between `/usr/lib/udev/rules.d` and `/etc/udev/rules.d`.
Don't add the services line to sssd.conf In Ubuntu and Debian, the sssd services (like nss, pam, pac, etc) are socket activated and should not be listed in the services line, as they will be started on demand by systemd.
