[SSSD] [PATCH] PAM: Allow to configure pam services for smartcards

[Lukas Slebodnik]

ehlo,

attached patch should fix ticket #2926

The default case (no adding, no removing services) is tested
by pam-srv-tests.

If the patch is not ready for stable branch sssd-1-13
then we might merge this case with GPO code which uses slightly
modified way using hash tables.

LS