conpaas-core: enable PCI Hotplug Support in OpenNebula cloud script

Make sure that instances load the kernel modules required by PCI hotplug.
http://www.linux-kvm.org/page/Hotadd_pci_devices


git-svn-id: svn://svn.forge.objectweb.org/svnroot/contrail/trunk/conpaas@5077 ef35cc4a-2640-4bbf-98bc-65920db7d8ae
conpaas-core: enable logging in conpaas.core.clouds.base


git-svn-id: svn://svn.forge.objectweb.org/svnroot/contrail/trunk/conpaas@5078 ef35cc4a-2640-4bbf-98bc-65920db7d8ae
conpaas-{director,core}: introduce OPENNEBULA_VERSION. Validate image size. 

By adding OPENNEBULA_VERSION as a new director configuration option we allow
users to specify the API compatibility level they need. Before this patch we
were using 2.2 as our api_level, meaning that features introduced in OpenNebula
versions > 2.2 were not accessible by ConPaaS.

This patch also checks if the image size specified in director.cfg is actually
supported by the OpenNebula installation in use.



git-svn-id: svn://svn.forge.objectweb.org/svnroot/contrail/trunk/conpaas@5079 ef35cc4a-2640-4bbf-98bc-65920db7d8ae