Update virtualbox image location for Ubuntu and use CentOS 6.5.
udpate backend serverspec test to add entry to /etc/hosts and remove --resolve from curl calls as it is not supported on curl version installed on CentOS 6.5
Required another FQDN in /etc/hosts.
Add /etc/hosts testing to "Verify backend configuration" block.
Merge pull request #4 from rightscale-cookbooks/white_14_04_acu111916_update_kitchenyml_centos65

White 14 04 acu111916 update kitchenyml centos65