Review Request 34969: Print executor status consistently in the example frameworks.

[Ben Mahler]

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https://reviews.apache.org/r/34969/
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Review request for mesos and Vinod Kone.


Repository: mesos


Description
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This uses WSTRINGIFY from status_utils.hpp instead of manually or incorrectly 
printing the status.


Diffs
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  src/examples/low_level_scheduler_libprocess.cpp 
bd228fd178d639146fe237794c39872dab9085cb 
  src/examples/low_level_scheduler_pthread.cpp 
81388f145ede3803ed5a533797a25d910d467316 
  src/examples/persistent_volume_framework.cpp 
6a0c0cb61a06d1a0e7608fe2447167c18111ea43 

Diff: https://reviews.apache.org/r/34969/diff/


Testing
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make check


Thanks,

Ben Mahler