Review Request 57112: Updated existing test cases to allow for frameworks to change its roles.

[Michael Park]

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https://reviews.apache.org/r/57112/
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Review request for mesos and Benjamin Mahler.


Bugs: MESOS-6627
    https://issues.apache.org/jira/browse/MESOS-6627


Repository: mesos


Description
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See summary.


Diffs
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  src/tests/master_validation_tests.cpp 
5a84c8d03cacd150ac61213a7c2d8613fd1780e7 

Diff: https://reviews.apache.org/r/57112/diff/


Testing
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Thanks,

Michael Park