Fix AWS error: InvalidPlacementGroup.Unknown

AWS's call to AuthorizeSecurityGroupIngress doesn't
like being called specifying the same UserID as the
current user.
Ganglia UI missing mod_php in apache

Add the libapache2-mod-php5 package to
fix missing php handler in apache
Merge pull request #27 from guarly/ubuntu_missing_apaches_mod_php

Ganglia UI missing mod_php in apache
Merge pull request #26 from guarly/aws_auth_error

Fix AWS error: InvalidPlacementGroup.Unknown