Fix Ansible: [WARNING]: Found both group and host with same name

Avoid setting group and host with the same name

requirements.txt

@@ -9,7 +9,7 @@ PyYAML==3.13
 azure-common==1.1.4
 azure==2.0.0rc5
 msrestazure==0.4.6
-jinja2<2.9
+Jinja2==2.10.1
 hashmerge
 python-consul
 hvac>=0.5.0

src/ops/inventory/ec2inventory.py

@@ -242,12 +242,16 @@ def get_host_info(self):
     def push(self, my_dict, key, element):
         ''' Push an element onto an array that may not have been defined in
         the dict '''
+        if key == element:
+            return
         group_info = my_dict.setdefault(key, [])
         if isinstance(group_info, dict):
             host_list = group_info.setdefault('hosts', [])
-            host_list.append(element)
+            if element not in host_list:
+                host_list.append(element)
         else:
-            group_info.append(element)
+            if element not in group_info:
+                group_info.append(element)
 
     def push_group(self, my_dict, key, element):
         ''' Push a group as a child of another group. '''