[SSSD] [PATCH] Fix authentication queue code for proxy auth

[Stephen Gallagher]

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We weren't decrementing the count of in-progress authentication
request child processes when they completed successfully. With
this patch, we will now guarantee that the process count is
accurate and that queued requests will be started when a slot is
freed up.

Fixes https://fedorahosted.org/sssd/ticket/660

- -- 
Stephen Gallagher
RHCE 804006346421761

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