Review Request 38496: Added devolve operation for V1 Executor Protobuf

[Anand Mazumdar]

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https://reviews.apache.org/r/38496/
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Review request for mesos, Ben Mahler, Isabel Jimenez, and Vinod Kone.


Bugs: MESOS-2907
    https://issues.apache.org/jira/browse/MESOS-2907


Repository: mesos


Description
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This change adds a trivial devolve call for V1 Executor Protobuf -> unversioned 
protobuf that can be used internally.


Diffs
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  src/internal/devolve.hpp f03cac5ce93fead70122ae76d537867f958317fe 
  src/internal/devolve.cpp 6cace660ef81a82ffab8b86d70c364a0718cffda 

Diff: https://reviews.apache.org/r/38496/diff/


Testing
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make check


Thanks,

Anand Mazumdar