Updated openstack/openstack
Project: openstack/neutron  5ced69fdbc659c400de631464daa630eacc4feea

Make VPNaaS 'InUse' exception more clear

In case IpSecPolicy or IKEPolicy is updated while VPN connection that uses it
is already established, IPsecPolicyInUse or IKEPolicuInUse is raised.
Need to clarify their messages to emphasize that policies can't be updated
because they are used by established connection.

Change-Id: I259f9b8bcff7f8ec13ac630285f6e881c6653309
Closes-Bug: #1315809