1229089 Synchronize nsswitch backend code with freeIPA

Authored and Committed by abbra 6 years ago
    Synchronize nsswitch backend code with freeIPA
    
    FreeIPA ipa-extdom-extop plugin uses the same logic as slapi-nis
    schema-compat plugin to handle requests to SSSD. Thus, we keep the
    code synchronized across both code bases. Since both plugins are loaded
    into the same address space we currently rename functions to allow them
    to co-exist. In future we'd move some of common code to a shared
    library.
    
        
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