Add the ability to configure the number of CPUs that will be used by the new VM

Add the ability to configure the number of CPUs that will be used by the new VM

== DETAILS

- Added a new configuration option "cpu_count"
- Modified clone.rb to change the number of cpu's on the clone spec to be equal to cpu_count, if specified.

== TESTING

- New spec
- Tested with vSphere 5.5