[sudo-workers] sssd and ldap sources bugfix

[Pavel Březina]

Hi,
I'm attaching three patches that fixes few bugs in sssd and ldap
sources.

1-sssd-noise.patch
When sudo is used with sssd and a local user runs sudo, an e-mail is
sent to administrator. This is because sssd does not manage sudo rules
for local users. This should not be considered as an error and thus no
e-mail should be sent.

Steps to Reproduce:
1. configure sudo to use sssd as data source ('sudoers: files sss' in
    /etc/nsswitch.conf
2. run sssd
3. log in as local user
4. run 'sudo -l' as local user

2-emallocfail.patch
sudo outputs an erealloc3 error whenever all retrieved sssd rules fail

sudoHost netgroup match

3-ldap-sssd-usermatch.patch
sudoRunAsUser #uid values match users neither with LDAP nor with SSSD
backends

Thanks Nikolai Kondrashov for reporting and fixing them.

Best regards,
Pavel Březina.
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