Fix issue with gem install option which is invalid for ruby used on CentOS 8
Fix issue with gem install option which is invalid for ruby used on CentOS 8

- Fixes #1099 from github issues.

Change-Id: I5320633ae20c2522c642987fcb98a42b73088065
Signed-off-by: Christopher M. Cantalupo <9cf3ecca60a3dd7112ab0e7250bedb8a752e3958@intel.com>
Signed-off-by: Brad Geltz <e42f3ad4099980ea02f08e076efbee5cf9d4a803@intel.com>

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