Add euca2ools 3.1 and requestbuilder 0.2.3

Add the following packages to our repo. All the VPC code in euca
has been upstreamed and hence no need to build our own euca pkg.
Also euca 3.1 has moved to requestbuilder and does not use boto.

Remove local copy of euca and boto from debian builds.

Change-Id: I5e911a6a4bb721056c51c023886cb7b0c9373a3f