Review Request 65448: Added a test to ensure master removes executors that never launched.

[Meng Zhu]

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Review request for mesos, Benjamin Mahler, Chun-Hung Hsiao, and Vinod Kone.


Bugs: MESOS-1720
    https://issues.apache.org/jira/browse/MESOS-1720


Repository: mesos


Description
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This test ensures that agent send exited executor message when the
executor is never launched. So that master's executor bookkeeping
entry is removed. See MESOS-1720.


Diffs
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  src/tests/master_tests.cpp 7112bb4efcc312dc4f68bdc44fb685c7624002b1 
  src/tests/slave_tests.cpp f393a8433a984267adc4db307ef07fcbafd1e62f 


Diff: https://reviews.apache.org/r/65448/diff/1/


Testing
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make check


Thanks,

Meng Zhu