Add support to rapl_pkg_limit_test for multi-sockets.
Add support to rapl_pkg_limit_test for multi-sockets.

- Use lscpu to get number of cores and sockets.
- Loop over sockets for test.

Change-Id: I8c29209dcab9b5b197fbbcb955a856642a837309
Signed-off-by: Christopher M. Cantalupo <9cf3ecca60a3dd7112ab0e7250bedb8a752e3958@intel.com>

cmcantalupo/geopm,geopm/geopm,geopm/geopm,cmcantalupo/geopm,cmcantalupo/geopm,geopm/geopm,cmcantalupo/geopm,geopm/geopm,cmcantalupo/geopm,geopm/geopm