Review Request 25373: Added a test for sending pending tasks during re-registration.

[Ben Mahler]

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https://reviews.apache.org/r/25373/
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Review request for mesos and Vinod Kone.


Bugs: MESOS-1715
    https://issues.apache.org/jira/browse/MESOS-1715


Repository: mesos-git


Description
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This uses a MockGarbageCollector and a detector to force the slave to 
re-register with a pending task.


Diffs
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  src/tests/fault_tolerance_tests.cpp b0e74b94db8a68cd676569d42b2ccd120f12b9d3 

Diff: https://reviews.apache.org/r/25373/diff/


Testing
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make check


Thanks,

Ben Mahler