This is WIP patch to unify format of
usernames and groupnames in sssd internals.

In current form it breaks just about everything.

The sysdb update function is just placeholder
and it's contents are irelevant.

Currently I am working on fqname attribute
removal because it seems to just add confusion.

If you decide to look into the code, please use
sunglasses or other other protective gear and play
some calm music in your backgroun to prevent
eye or brain injury.

Function entry_has_objectclass is not used just
for users.

Add function to create internal fqname in format
shortname@domname where domain portion is lowercased.

Add lightweight function to parse internal fqname format
(shortname@domain). This function does not require the
sss_names to be initialized.

We would previously only print the generic warning, not the
user-supplied error message.

Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>
Reviewed-by: Petr Cech <pcech@redhat.com>

Since originalMemerberOf is not mapped directly to an original attribute
and is handled specially it is not automatically removed if there is no
memberOf in the original object anymore. This patch put
originalMemerberOf on the list of attribute which should be removed in
that case.

Resolves https://fedorahosted.org/sssd/ticket/2917

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

Resolves:
https://fedorahosted.org/sssd/ticket/2765

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>