Modify requirements to avoid pytables 3.6.0
Modify requirements to avoid pytables 3.6.0

- Pytables 3.6.0 and newer have dropped python2 support.

Change-Id: Ibec95339f832a8eb5e0a30fadf11ffc214ade188
Signed-off-by: Christopher M. Cantalupo <9cf3ecca60a3dd7112ab0e7250bedb8a752e3958@intel.com>

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