Use kubernetes provider to manage aws auth (#355)

This commit changes the way aws auth is managed. Before a local file
was used the generate the template and a null resource to apply it. This
is now switched to the terraform kubernetes provider.

templates/config-map-aws-auth.yaml.tpl

@@ -1,19 +0,0 @@
-apiVersion: v1
-kind: ConfigMap
-metadata:
-  name: aws-auth
-  namespace: kube-system
-data:
-  mapRoles: |
-${worker_role_arn}
-  %{if chomp(map_roles) != "[]" }
-    ${indent(4, map_roles)}
-  %{ endif }
-  %{if chomp(map_users) != "[]" }
-  mapUsers: |
-    ${indent(4, map_users)}
-  %{ endif }
-  %{if chomp(map_accounts) != "[]" }
-  mapAccounts: |
-    ${indent(4, map_accounts)}
-  %{ endif }

templates/worker-role.tpl

@@ -1,8 +1,8 @@
-    - rolearn: ${worker_role_arn}
-      username: system:node:{{EC2PrivateDNSName}}
-      groups:
-        - system:bootstrappers
-        - system:nodes
-        %{~ if platform == "windows" ~}
-        - eks:kube-proxy-windows
-        %{~ endif ~}
+- rolearn: ${worker_role_arn}
+  username: system:node:{{EC2PrivateDNSName}}
+  groups:
+    - system:bootstrappers
+    - system:nodes
+    %{~ if platform == "windows" ~}
+    - eks:kube-proxy-windows
+    %{~ endif ~}