Removing the Cert V3 Enable flag from configuration

From this time forward, all candlepins will be enabled.
Use of the old config entry will be ignored.
Removed tests that considered the V3 disablement.
Removed spec test system-test flag.
Merge pull request #218 from candlepin/wottop/remove-cert-V3-enable

Removing the Cert V3 Enable flag from configuration