Use a script to update DEBUG macro invocations to use it as a variadic
macro, supplying format string and its arguments directly, instead of
wrapping them in parens.

This script was used to update the code:

grep -rwl --include '*.[hc]' DEBUG . |
    while read f; do
        mv "$f"{,.orig}
        perl -e \
            'use strict;
             use File::Slurp;
             my $text=read_file(\*STDIN);
             $text=~s#(\bDEBUG\s*\([^(]+)\((.*?)\)\s*\)\s*;#$1$2);#gs;
             print $text;' < "$f.orig" > "$f"
        rm "$f.orig"
    done

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
Reviewed-by: Stephen Gallagher <sgallagh@redhat.com>
Reviewed-by: Simo Sorce <simo@redhat.com>

sss_idmap_domain_has_algorithmic_mapping can return also
IDMAP_SID_INVALID, but it does not mean that idmaping is
unavailable. We should fall back to another method of detection
(sss_idmap_domain_by_name_has_algorithmic_mapping)
and do not return false immediately.

Resolves:
https://fedorahosted.org/sssd/ticket/2172

For id_provider ldap, it is only necessary to enable option ldap_id_mapping.
It is an regression introduced in the commit d3e1d88ce7de3216a862b

Resolves:
https://fedorahosted.org/sssd/ticket/2172

When libss_idmap was only used to algorithmically map a SID to a POSIX
ID a domain SID was strictly necessary and the only information needed
to find a domain.

With the introduction of external mappings there are cases where a
domain SID is not available. Currently we relied on the fact that
external mapping was always used as a default if not specific
information about the domain was found. The lead to extra CPU cycles and
potentially confusing debug messages. Adding the domain name as a search
parameter will avoid this.

Currently we relied on the fact that external ID mapping is used as
default fallback in case of an error and did not properly add subdomains
with external ID mapping to the idmap library. If debugging is enabled
this leads to irritating debug messages for every user or group lookup.

With this patch this subdomains are added to the idmap library.

Fixes https://fedorahosted.org/sssd/ticket/2105

Remove code duplication.

This patch implements a wrapper for
sss_idmap_domain_has_algorithmic_mapping() for the sdap ID mapping.

Fixes https://fedorahosted.org/sssd/ticket/1960