Review Request 40998: Reinstated previously reverted commit around CHECK's for ordered delivery of messages in Command Executor.

[Anand Mazumdar]

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Review request for mesos and Ben Mahler.


Bugs: MESOS-3851
    https://issues.apache.org/jira/browse/MESOS-3851


Repository: mesos


Description
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This change reinstates the previously reverted commit 
`b6d4b28a4c9ca717ad8be5bbc27e40c005fc51ad`
https://github.com/apache/mesos/commit/b6d4b28a4c9ca717ad8be5bbc27e40c005fc51ad#diff-3ddba917cc11631eb5ede254da408a27


Diffs
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  src/launcher/executor.cpp f90ea01131e6fa28e42f0c00a317d66a49f81ffa 

Diff: https://reviews.apache.org/r/40998/diff/


Testing
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make check


Thanks,

Anand Mazumdar