Request for review, time_pps_fetch() enhancement

[Ian Lepore]

I'd like feedback on the attached patch, which adds support to our
time_pps_fetch() implementation for the blocking behaviors described in
section 3.4.3 of RFC 2783.  The existing implementation can only return
the most recently captured data without blocking.  These changes add the
ability to block (forever or with timeout) until a new event occurs.

-- Ian

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