Merged in feature/networking-tests-xen-final (pull request #29)

Feature/networking tests xen final

* recipes-core/images/bluegreen-container-stressor-image.bb: add coreutils to container

* recipes-core/images/bluegreen-guest-vm-image.bb: add VM MAC ADDRESS

* recipes-core/images/files/bluegreen-guest-vm.conf.sample: add mac address

* recipes-extended/xen/files/xen.cfg.in: change maxcpus to 4

* recipes-extended/xen/xen_%.bbappend: increase memory size of dom0

* recipes-core/images/bluegreen-guest-vm-image.bb: correct typos


Approved-by: Bertrand Mandrin