[SSSD] [PATCH] intg: Add more LDAP tests

[Nikolai Kondrashov]

Hi everyone,

Here is a patch set fixing some things in integration tests and adding more
LDAP tests:

     * Adding/removing a user/group/membership with rfc2307(bis) schema.
     * Filtering users/groups with rfc2307(bis) schema.
     * The effect of override_homedir option.
     * The effect of fallback_homedir option.
     * The effect of override_shell option.
     * The effect of shell_fallback option.
     * The effect of default_shell option.
     * The effect of vetoed_shells option.

These are pretty basic, but I think they're good for the start.
Suggestions for more tests are welcome :)

NOTE: These still break test_memory_cache.py as seen in the attached log file.
       We need to figure out why and do something with it. Otherwise, the
       tests work fine.

Nick