Overview of changes in 3.18.6
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* Bugs fixed:
 756431 Fix a few leaks in goa-identity-service
 756495 identity: don't ignore almost all renewal requests
 762155 Skip EnsureCredentials if the account is disabled
 768845 kerberos: Don't leak the GSimpleAsyncResult and object_path when
        signing in

* Updated translations:
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