Review Request 34910: Added task validation for task using revocable resources while its executor does not.

[Vinod Kone]

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Review request for mesos, Ben Mahler, Ian Downes, Jie Yu, and Joris Van 
Remoortere.


Bugs: MESOS-2753
    https://issues.apache.org/jira/browse/MESOS-2753


Repository: mesos


Description
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Enforces the invariant that a task cannot use revocable resources unless its 
executor does.


Diffs
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  src/master/validation.cpp 1793b0e16fc36ead147880ee06cda40b23fa0962 
  src/tests/master_validation_tests.cpp 
dc9e91e120c2af9e72013557730f6a2fbb5b00fe 

Diff: https://reviews.apache.org/r/34910/diff/


Testing
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make check


Thanks,

Vinod Kone