Summary:
Notable changes since 0.7.1:
* Support for ethtool stats.
* New cgroup stats including per-cgroup zswap memory usage, memory.min
  and kernel field from memory.stat.
* /sys/fs/resctrl data collection.
* /proc/slabinfo collection and display.
* viewrc support for `cgroup_name_width` to configure cgroup view name
  column width.

Fixes:
* Exitstat bpf program is fixed.

Pull Request resolved: https://github.com/facebookincubator/below/pull/8226

Reviewed By: antonis-m

Differential Revision: D55491440

Pulled By: brianc118

fbshipit-source-id: 989004d5e6a3618e598a7efc8e59643dba19cfd3