RFR : 8196062 : Enable docker container related tests for linux ppc64le

[Baesken, Matthias]

Hello,  could you please review the following change :  8196062 :  Enable docker container related tests for linux ppc64le  .

It  adds  docker container testing   for linux ppc64 le  (little endian) .

A number of things had to be done :

  *   Add a  separate  docker file      test/hotspot/jtreg/runtime/containers/docker/Dockerfile-BasicTest-ppc64le      for linux ppc64 le     which uses   Ubuntu ( the  Oracle Linux 7.2  used  for x86_64  seems not to be available for ppc64le )
  *   Fix  parsing    /proc/self/mountinfo    and   /proc/self/cgroup  in    src/hotspot/os/linux/osContainer_linux.cpp    , it could  not  handle  the format seen  on SUSE LINUX 12.1 ppc64le (Host)  and  Ubuntu (Docker container)
  *   Add a bit  more logging


Webrev :

http://cr.openjdk.java.net/~mbaesken/webrevs/8196062/


Bug :

https://bugs.openjdk.java.net/browse/JDK-8196062


After these adjustments I could run the    runtime/containers/docker    -  jtreg tests successfully .


Best regards, Matthias