Fix issues in geopm_launcher.py script.
Fix issues in geopm_launcher.py script.

- When host is not in the list, warning message was failing.

Change-Id: I13b884bdf08edc470f2c55f19e33e3c26fad6f69
Signed-off-by: Christopher M. Cantalupo <9cf3ecca60a3dd7112ab0e7250bedb8a752e3958@intel.com>

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