fix(aws): error with other instances without tags

while starting the cluster, and having already other non-kubernetes
instances active without tags, an KeyError throwed.
enhancement(aws): checks for existing kubernetes vpc first

without this check, kube-up creates a new vpc every time. Now it will
reuse the vpc tagged Kubernetes.
enhancement(aws): using iam role to pass aws credentials
enhancement(aws): added logging variable and more verbose output
fix(aws): fix with non us standard region
fix(aws): cloud provider wasn't set, corrected cloud config syntax
Merge branch 'master' of https://github.com/dutchcoders/kubernetes into dutchcoders-master

Conflicts:
	cluster/aws/config-default.sh
	cluster/saltbase/salt/kube-controller-manager/default
Update aws.
Merge pull request #3068 from brendandburns/dutchcoders-master

Fix up AWS support...