[SSSD] [PATCH] NSS obfuscation code cleanup

[Jakub Hrozek]

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https://fedorahosted.org/sssd/ticket/752

I think we can leave initialization as it is now - since we only get the
obfuscated password once at the startup. If we needed to treat that
functionality as a library, we might need to switch to NSS_InitContext()
and NSS_ShutdownContext() per Bob Relyea's advice.
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