Fix default profile name when using the launcher.
Fix default profile name when using the launcher.

- Old implementation would use first command line option that is not
  geopm specfic.
- New implementation uses the Environment C++ class to get the applicaiton
  name by specifying an empty string for GEOPM_PROFILE.
- Moved to all getters and setters for interacting with the Config object.

Change-Id: I42902d1d020b45c0b6cf150d30f26bfc338043e2
Signed-off-by: Christopher M. Cantalupo <9cf3ecca60a3dd7112ab0e7250bedb8a752e3958@intel.com>

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