No longer installing EC2 tools and euca2ools

Since the rewrite to Python, the tools use boto to talk to EC2 and Eucalyptus. Thus we don't need the EC2 tools and Euca2ools. Removed them as well as the packages they required.

As the AppController does use the EC2 tools and Euca2ools (installed here erroneously instead of in the main AppScale build script), don't merge this in until (https://github.com/AppScale/appscale/pull/308) has been merged (which removes that dependency).