[FEATURE] Make ec2 module working in all the regions (#122)

EXAMPLE/cluster_defs/aws/cluster_vars__cloud.yml

@@ -24,3 +24,8 @@ cluster_vars:
 #      ports: ["{{ prometheus_node_exporter_port | default(9100) }}"]
 #      group_name: ["{{buildenv}}-private-sg"]
 #      rule_desc: "Prometheus instances attached to {{buildenv}}-private-sg can access the exporter port(s)."
+
+
+# Some of the regions are not available for aws module boto.ec2. If the region definitely exists, you may need to upgrade boto or extend with endpoints_path
+# Adding the below to ec2 invocation fixes the issue
+  aws_endpoint_url: https://ec2.{{region}}.amazonaws.com

create/tasks/create_aws.yml

@@ -56,6 +56,7 @@
         volumes: "{{ item.auto_volumes | selectattr('src', 'undefined') | list | default([]) }}"
         count_tag: { Name: "{{item.hostname}}" }
         exact_count: 1
+        ec2_url: "{{ cluster_vars.aws_endpoint_url | default(omit) }}"
       vars:
         _instance_tags:
           Name: "{{item.hostname}}"