AWS support draft

Fix calling function before declaration

Set Name tags on instances

Hide import-key-pair error

Fix instances names resolution

Implement kube-down for AWS provider

Add cluster validation routines. Make changes according to #1255

Implement post-deployment cluster validation

Set proper master name in userdata scripts

Fix kube-down path in hint

Add getting started for AWS

cluster/kube-env.sh

@@ -18,6 +18,6 @@
 # You can override the default provider by exporting the KUBERNETES_PROVIDER
 # variable in your bashrc
 #
-# The valid values: 'gce', 'azure', 'vagrant', 'local', 'vsphere'
+# The valid values: 'gce', 'aws', 'azure', 'vagrant', 'local', 'vsphere'
 
 KUBERNETES_PROVIDER=${KUBERNETES_PROVIDER:-gce}