feat(itim): dont force config key, validate when it's required

ref: #247 #69

app/itim/forms/services.py

@@ -44,6 +44,7 @@ class ServiceForm(CommonModelForm):
         dependent_service = cleaned_data.get("dependent_service")
         device = cleaned_data.get("device")
         cluster = cleaned_data.get("cluster")
+        config_key_variable = cleaned_data.get("config_key_variable")
         is_template = cleaned_data.get("is_template")
         template = cleaned_data.get("template")
         port = cleaned_data.get("port")
@@ -65,6 +66,10 @@ class ServiceForm(CommonModelForm):
 
                 raise ValidationError('Port(s) must be assigned to a service.')
 
+        if not is_template and not config_key_variable:
+
+            raise ValidationError('Configuration Key must be specified')
+
         if dependent_service:
 
             for dependency in dependent_service:

app/itim/models/services.py

@@ -169,7 +169,7 @@ class Service(TenancyObject):
     )
 
     config_key_variable = models.CharField(
-        blank = False,
+        blank = True,
         help_text = 'Key name to use when merging with cluster/device config.',
         max_length = 50,
         null = True,