Make node status methods static.
Make node status methods static.

- Needed so that these can be called before a launcher object is fully
  created.

Change-Id: I2a7b4305554e474287976160d90514dd409bda01
Signed-off-by: Brad Geltz <e42f3ad4099980ea02f08e076efbee5cf9d4a803@intel.com>

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