sync neutron.common.exceptions into neutron-lib

While the common exceptions have already been rehomed into neutron-lib
[1] and have been shimmed in neutron [2], folks continue to add them
to neutron.common.exceptions. This patch syncs them by rehoming those
that have been added to neutron after the fact.

[1] https://review.openstack.org/#/c/319328/
[2] https://review.openstack.org/#/c/586525/

Change-Id: I10f6bf2d62c95613627101c3fdd7c9cb98d494db

neutron_lib/exceptions/__init__.py

@@ -786,3 +786,24 @@ class FailedToAddQdiscToDevice(NeutronException):
 class PortBindingNotFound(NotFound):
     message = _("Binding for port %(port_id)s for host %(host)s could not be "
                 "found.")
+
+
+class PortBindingAlreadyActive(Conflict):
+    message = _("Binding for port %(port_id)s on host %(host)s is already "
+                "active.")
+
+
+class PortBindingAlreadyExists(Conflict):
+    message = _("Binding for port %(port_id)s on host %(host)s already "
+                "exists.")
+
+
+class PortBindingError(NeutronException):
+    message = _("Binding for port %(port_id)s on host %(host)s could not be "
+                "created or updated.")
+
+
+class ProcessExecutionError(RuntimeError):
+    def __init__(self, message, returncode):
+        super(ProcessExecutionError, self).__init__(message)
+        self.returncode = returncode

neutron_lib/exceptions/qos.py

@@ -95,3 +95,13 @@ class TcLibQdiscTypeError(e.NeutronException):
 class TcLibQdiscNeededArguments(e.NeutronException):
     message = _("TC Qdisc type %(qdisc_type)s needs following arguments: "
                 "%(needed_arguments)s.")
+
+
+class RouterQosBindingNotFound(e.NotFound):
+    message = _("QoS binding for router %(router_id)s gateway and policy "
+                "%(policy_id)s could not be found.")
+
+
+class RouterQosBindingError(e.NeutronException):
+    message = _("QoS binding for router %(router_id)s gateway and policy "
+                "%(policy_id)s could not be created: %(db_error)s.")

releasenotes/notes/rehome-common-exceptions-eda074ddb02349ab.yaml

@@ -0,0 +1,7 @@
+---
+features:
+  - The following exceptions from ``neutron.common.exceptions`` have been
+    rehomed into neutron-lib; ``PortBindingAlreadyActive``,
+    ``PortBindingAlreadyExists``, ``PortBindingError``,
+    ``ProcessExecutionError``, ``RouterQosBindingNotFound``,
+    ``RouterQosBindingError``.