Remove UnknownNetworkType InvalidAddressRequest and IPAllocationFailed

These exception classes are defined but never raised or referenced
anywhere in the codebase. Remove them to reduce dead code.

Assisted-By: Claude Opus 4.6
Signed-off-by: Rodolfo Alonso Hernandez <ralonsoh@redhat.com>
Change-Id: Ia1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0

neutron/ipam/exceptions.py

@@ -39,11 +39,6 @@ class InvalidIpForSubnet(exceptions.BadRequest):
     message = _("IP address %(ip)s does not belong to subnet %(subnet_id)s")
 
 
-class InvalidAddressRequest(exceptions.BadRequest):
-    message = _("The address allocation request could not be satisfied "
-                "because: %(reason)s")
-
-
 class InvalidSubnetRequest(exceptions.BadRequest):
     message = _("The subnet request could not be satisfied because: "
                 "%(reason)s")
@@ -72,10 +67,6 @@ class IpAddressGenerationFailureNoMatchingSubnet(IpAddressGenerationFailure):
                 "network %(network_id)s, service type %(service_type)s.")
 
 
-class IPAllocationFailed(exceptions.NeutronException):
-    message = _("IP allocation failed. Try again later.")
-
-
 class IpamValueInvalid(exceptions.Conflict):
     def __init__(self, message=None):
         self.message = message

neutron/plugins/ml2/common/exceptions.py

@@ -40,8 +40,3 @@ class ExtensionDriverNotFound(exceptions.InvalidConfigurationOption):
     """Required extension driver not found in ML2 config."""
     message = _("Extension driver %(driver)s required for "
                 "service plugin %(service_plugin)s not found.")
-
-
-class UnknownNetworkType(exceptions.NeutronException):
-    """Network with unknown type."""
-    message = _("Unknown network type %(network_type)s.")