Merged in feature/class-bluegreen-guest-vm-config (pull request #31)

Feature/class bluegreen guest vm config

* classes/bluegreen_guest_vm_image.bbclass: inherit new class

* recipes-core/images/bluegreen-guest-vm-image.bb: add CPUS variable

* recipes-core/images/files/bluegreen-guest-vm.conf.sample: add CPUS variable

* classes/bluegreen_guest_vm_config.bbclass: add new classes for variables CPUS and MAC_ADDRESS

* package inherit the new class

* classes/bluegreen_guest_vm_config.bbclass: rename EWAOL_GUEST_VM variable to BLUEGREEN_GUEST_VM

* recipes-core/images/bluegreen-guest-vm-image.bb: rename EWAOL_GUEST_VM variable to BLUEGREEN_GUEST_VM

* recipes-core/images/files/bluegreen-guest-vm.conf.sample: rename EWAOL_GUEST_VM variable to BLUEGREEN_GUEST_VM

* classes/bluegreen_guest_vm_config.bbclass: add comments about the new class


Approved-by: Bertrand Mandrin