This converts memcg stress tests and its helper to LTP newlib and performs a general cleanup. This patch is dependent on [1] since it factors out a common helper to cgroup_lib.sh (introduced in [1]) Cristian Marussi (1): [LTP] memcg_stress_test.sh: ported to newlib [1]: http://lists.linux.it/pipermail/ltp/2018-December/010385.html