Review Request 62230: Avoid GC pruning events from blocking other processes.

[Chun-Hung Hsiao]

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https://reviews.apache.org/r/62230/
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Review request for mesos, Benjamin Mahler, Jie Yu, and Jiang Yan Xu.


Bugs: MESOS-7964
    https://issues.apache.org/jira/browse/MESOS-7964


Repository: mesos


Description
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This patch dispatches GC pruning events to `GarbageCollectorProcess`
instead of multiple `AsyncExecutor`s such that if multiple heavy-duty
pruning events won't occupy all worker threads and block other actors.


Diffs
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  src/slave/gc.cpp 83e4e2f3aba5c0d9900cf0beeea6e92320f889e7 


Diff: https://reviews.apache.org/r/62230/diff/1/


Testing
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sudo make test


Thanks,

Chun-Hung Hsiao