Create a validation scripts to assist in troubleshooting common issues

[geremyCohen]

We need a script that can be run to verify the environment. This can save a ton of time automating this process.

Pre Setup

. Cloud9 default EC2 profile has been disabled
. Environmental vars are set correctly
. That the account can create an ELB (per #544)

Post Cluster Install

. VPC and subnets are tagged correctly
. Heptio-derived username matches cluster-owner username
. sts get-caller-identification username matches cluster-owner-username

Post kubeconfig creation

. cluster name is identical in both EKS and kubeconfig
. cert is identical in both EKS and kubeconfig
. endpoint is identical in both EKS and kubeconfig

[christopherhein]

Nice!