Review Request: Fixes a bug in the replicated log that doesn't correctly remove "missing" positions after a truncation.

[Benjamin Hindman]

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https://reviews.apache.org/r/4646/
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Review request for mesos, John Sirois and Bill Farner.


Summary
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See summary.


Diffs
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  src/log/replica.cpp 8915c96 

Diff: https://reviews.apache.org/r/4646/diff


Testing
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make check


Thanks,

Benjamin