Adds ExternalIpAddressExhaustedClient exception

Adds the ExternalIpAddressExhaustedClient exception so
a more specific exception than NeutronClientException is raised
when IPs run out. This will allow for better exception
handling in Nova.

Closes-Bug: 1233143

Change-Id: I9f40bf14eec0f485dfd21b36605a2474b99a8941

Author: Chris Yeoh

neutronclient/common/exceptions.py

@@ -94,6 +94,10 @@ class IpAddressGenerationFailureClient(NeutronClientException):
     pass
 
 
+class ExternalIpAddressExhaustedClient(NeutronClientException):
+    pass
+
+
 class Unauthorized(NeutronClientException):
     message = _("Unauthorized: bad credentials.")
 

neutronclient/v2_0/client.py

@@ -51,7 +51,9 @@ def exception_handler_v20(status_code, error_content):
         'PortInUse': exceptions.PortInUseClient,
         'AlreadyAttached': exceptions.AlreadyAttachedClient,
         'IpAddressGenerationFailure':
-        exceptions.IpAddressGenerationFailureClient, }
+        exceptions.IpAddressGenerationFailureClient,
+        'ExternalIpAddressExhausted':
+        exceptions.ExternalIpAddressExhaustedClient, }
 
     error_dict = None
     if isinstance(error_content, dict):