Moved function from configure-rdo.sh to utils.sh

When trying to run configure-rdo.sh, I received an error
"config_openstack_network_adapter not found". So I moved the function
from configure-rdo.sh to utils.sh and the problem is now solved. It
works both on Havana and Icehouse
Merge pull request #8 from adynezu/master

Moved function from configure-rdo.sh to utils.sh