Review Request: Added cgroups::hierarchies to list the currently active hierarchies and cgroups::internal::cloneCpusetValues in order to copy cpuset.cpus and cpuset.mems from a parent to a child cgroup. Also updated code to use path::join as appropriate.

[Benjamin Hindman]

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https://reviews.apache.org/r/7620/
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Review request for mesos, Vinod Kone, Jie Yu, and Ben Mahler.


Description
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See summary.


Diffs
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  src/linux/cgroups.hpp f0e343d9348075484fa5a4be739a5cef8b9dea21 
  src/linux/cgroups.cpp 58e9fec193cf0da39fdbee3ee1891fd716a63bbb 
  third_party/libprocess/include/stout/path.hpp 
e64f8a01d004c5e6513880ed2a1a85d4ec4f9e8b 

Diff: https://reviews.apache.org/r/7620/diff/


Testing
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make check


Thanks,

Benjamin Hindman