Adds IpAddressGenerationFailureClient exception

Adds the IpAddressGenerationFailureClient exception so
a more specific exception than NeutronClientException is raised
when IPs run out. This will allow for better exception
handling in Nova and help fix nova bug 1212137

Change-Id: I921ba5d5f5ee3dc9620dcdbbd04d6fef824c9a53
Closes-Bug: 1231836

neutronclient/common/exceptions.py

@@ -90,6 +90,10 @@ class AlreadyAttachedClient(NeutronClientException):
     pass
 
 
+class IpAddressGenerationFailureClient(NeutronClientException):
+    pass
+
+
 class Unauthorized(NeutronClientException):
     message = _("Unauthorized: bad credentials.")
 

neutronclient/v2_0/client.py

@@ -49,7 +49,9 @@ def exception_handler_v20(status_code, error_content):
         'PortNotFound': exceptions.PortNotFoundClient,
         'RequestedStateInvalid': exceptions.StateInvalidClient,
         'PortInUse': exceptions.PortInUseClient,
-        'AlreadyAttached': exceptions.AlreadyAttachedClient, }
+        'AlreadyAttached': exceptions.AlreadyAttachedClient,
+        'IpAddressGenerationFailure':
+        exceptions.IpAddressGenerationFailureClient, }
 
     error_dict = None
     if isinstance(error_content, dict):