conpaas-core: fix tun module issue with ec2 Virginia AMI


git-svn-id: svn://svn.forge.objectweb.org/svnroot/contrail/trunk/conpaas@4916 ef35cc4a-2640-4bbf-98bc-65920db7d8ae
conpaas-core: install 'curl' in ec2 image creation script


git-svn-id: svn://svn.forge.objectweb.org/svnroot/contrail/trunk/conpaas@4917 ef35cc4a-2640-4bbf-98bc-65920db7d8ae