Use profile for vpc creation.

playbooks/roles/edx_vpc/tasks/main.yml

@@ -32,6 +32,7 @@
 # to the vpc whose subnets and rts are not enumerated here.
 - name: create a vpc
   local_action:
+    profile: "{{ vpc_aws_profile }}"
     module: "ec2_vpc_local"
     resource_tags: "{{ vpc_tags }}"
     cidr_block: "{{ vpc_cidr }}"