Review Request: Added fixtures to enable templatized isolation module tests and fixed a bug in cgroups isolation module.

[Vinod Kone]

-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/9847/
-----------------------------------------------------------

Review request for mesos, Benjamin Hindman and Ben Mahler.


Description
-------

With the new fixtures, one can implement a typed test, for isolation modules, 
as follows. 

template <typename T>
class SlaveRecoveryTest : public IsolationTest<T>
{
 T isolationModule;
};


Diffs
-----

  src/slave/cgroups_isolation_module.hpp 
11244802b3210ef1a6900b978faf8bbcaa00266c 
  src/slave/cgroups_isolation_module.cpp 
9395d9cd6cf2ac7a720480b778836eb1d704e00d 
  src/tests/utils.hpp d3efa58ef62383af9eb051b23feb950ba6a4f4e3 

Diff: https://reviews.apache.org/r/9847/diff/


Testing
-------

make check


Thanks,

Vinod Kone