Use native strings in TestAgent policies
Use native strings in TestAgent policies

- agent.py has been updated so callers can use native strings. Reflect
  that change in the tests.

Signed-off-by: Daniel Wilson <c0a46a3457096bdbf302f01d2d37cf72d30c651c@intel.com>
Change-Id: I82b74ddbc2b21b9a0aa3b383c73d7eeb95e3a61f

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