Always send AUTHDIR_NEWDESC events in response to new descriptors
There are two cases where we don't send an AUTHDIR_NEWDESCS event:
- when we reject a descriptor due to keypinning, and
- when we drop a descriptor, but not due to cosmetic differences
This is a bug on tor-0.2.0.1-alpha and tor-0.2.7.2-alpha.
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