[LTP] [PATCH v2 0/4] cgroup tests newlib-porting

[Cristian Marussi]

This series converts cgroup/ regression tests to LTP newlib and performs
a general cleanup as follows:

- remove bashism from all tests' scripts
- mostly remove usage of global vars
- convert to SPDX headers
- expose a controllers' common /proc/mounts parsing function
- rename tests' helpers prefixing them with a test-specific tag to avoid
  name clashes on install: I have not renamed the tests' helpers using
  more specific meaningful name, since all of them performs really
  trivial ops needed and meaningful in the context of the regression-test
  subcase they serve; so I thought it would have been better to keep their
  names as they are now, bound to the subcase they help.

Cristian Marussi (4):
  [LTP] cgroup_regression_test.sh ported to newlib
  [LTP] cgroup_regression_test.sh cleanup
  [LTP] cgroup_regression_test.sh: added helper
  [LTP] cgroup: helpers various fixes