[SSSD] [PATCHES] Handle nested groups in RFC2307bis (master)

[Stephen Gallagher]

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These patches are forward-ported from the work done in SSSD 1.2.4.

Patch 0001: Add options for managing nested group limits.

Patch 0002: Shortcut out of sdap_save_users() if there are no users to
save, rather than starting a useless LDB transaction.

Patch 0003: Handle nested groups in RFC2307bis

Like SSSD 1.2.4, these patches only handle the generic case of
RFC2307bis and do not perform any of the optimizations available when
memberOf support is available.

- -- 
Stephen Gallagher
RHCE 804006346421761

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