Update default['openstack']['yum']['repo-key']
Update default['openstack']['yum']['repo-key']

Some yum commands are failing as raw.github.com now redirects to
raw.githubusercontent.com.  This change simply updates to the new
destination URL to avoid the redirect.

Change-Id: Iec727f20042eec6751968dd6b2dff2e61e74502e

tomzo/cookbook-openstack-common,krtyyy/cookbook-openstack-common,tomzo/cookbook-openstack-common,openstack/cookbook-openstack-common,tomzo/cookbook-openstack-common,openstack/cookbook-openstack-common,krtyyy/cookbook-openstack-common,krtyyy/cookbook-openstack-common