Review Request 51157: Added testing for the container plugin of the CLI.

[Haris Choudhary]

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https://reviews.apache.org/r/51157/
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Review request for mesos, Joseph Wu and Kevin Klues.


Bugs: mesos-5676
    https://issues.apache.org/jira/browse/mesos-5676


Repository: mesos


Description
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While introducing testing for the container plugin, some changes
were made to the plugin methods themselves mainly to allow the return
of stdout by methods that make use of nsenter is some way.


Diffs
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  src/cli_new/bin/tests.py PRE-CREATION 
  src/cli_new/lib/mesos/plugins/container/main.py PRE-CREATION 
  src/cli_new/lib/mesos/plugins/container/tests.py PRE-CREATION 

Diff: https://reviews.apache.org/r/51157/diff/


Testing
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![Tested on Ubuntu 14.04](http://i.imgur.com/Wo30SBw.png)


Thanks,

Haris Choudhary