upgrades: fix ec2api conditional
upgrades: fix ec2api conditional

Rename ec2-api_enabled to ec2_api_enabled so we avoid this error:
The conditional check 'ec2-api_enabled.rc == 0' failed.
The error was: error while evaluating conditional
(ec2-api_enabled.rc == 0): 'api_enabled' is undefined"}

Change-Id: Id325fd7eba397155eac7fb6c7410f88486173ba1

dprince/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,openstack/tripleo-heat-templates