Adds apt-get update to fix wonky ubuntu pkg install bug I ran into

playbooks/files/edx-server-ubuntu-configuration.json

@@ -149,6 +149,7 @@
             "  exit 1\n",
             "}\n",
 
+            "apt-get update",
             "apt-get -y install python-setuptools\n",
             "echo \"Python Tools installed\" - `date` >> /home/ubuntu/cflog.txt\n",
             "easy_install https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-latest.tar.gz\n",