[SSSD] [PATCH] Handle errors during log reopening better

[Stephen Gallagher]

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This patch makes two changes:

1) If we receive an error from rotating the logs, add it to the syslog
message
2) Check for EINTR when closing the debug file and retry.

This will either resolve https://fedorahosted.org/sssd/ticket/668 or at
minimum help identify it.

- -- 
Stephen Gallagher
RHCE 804006346421761

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