Review Request 57269: Added a test to ensure allocation roles are exposed in master API.

[Jay Guo]

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https://reviews.apache.org/r/57269/
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Review request for mesos and Benjamin Mahler.


Bugs: MESOS-7158
    https://issues.apache.org/jira/browse/MESOS-7158


Repository: mesos


Description
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This test ensures that allocation roles of tasks and executors are
exposed via `/state` endpoint of master v0 API.


Diffs
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  src/tests/master_tests.cpp b9dfe9eb7d759550673896980cffc3909f4c0105 


Diff: https://reviews.apache.org/r/57269/diff/1/


Testing
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Added a test `MasterTest.StateEndpointAllocationRole`

make check


Thanks,

Jay Guo