More minor refactorings.
More minor refactorings on centos payload, renamed to x64 pattern.
Segregated centos kickstart config file to each version (5.10 and 6.5).
Updated centos sudoers script to handle 5.10 and 6.5 versions.
Created Centos 5.10 payload to provision vagrant machine.
Updated centos 6.5 payload to use respective kickstart file.