Review Request 36755: Passed env vars returned by Isolator::prepare() to executor.

[Kapil Arya]

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Review request for mesos and Jie Yu.


Bugs: MESOS-3133
    https://issues.apache.org/jira/browse/MESOS-3133


Repository: mesos


Description
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Append the environment variables returned by Isolator::prepare() to the
list of environment variables being passed to the executor. Added a test
to verify that the executor is launched with the said environment
variables.


Diffs
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  src/slave/containerizer/mesos/containerizer.cpp 
609620c4322e41562597ee682b311cd320bca6d2 
  src/tests/containerizer_tests.cpp 88c46e7214f4d92b7d6a9b433a3a0497681dc6db 

Diff: https://reviews.apache.org/r/36755/diff/


Testing
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make check with an added test.


Thanks,

Kapil Arya