conpaas: convention fixes (image creation script)


git-svn-id: svn://svn.forge.objectweb.org/svnroot/contrail/trunk/conpaas@5495 ef35cc4a-2640-4bbf-98bc-65920db7d8ae
conpaas: use http.debian.net as the default debian mirror in create-img-script.cfg

git-svn-id: svn://svn.forge.objectweb.org/svnroot/contrail/trunk/conpaas@5496 ef35cc4a-2640-4bbf-98bc-65920db7d8ae