Add a fingerprint for bug 1321494

Adds a fingerprint for a known issue wrt ironic node locking
that causes occasional failures of the tempest-dsvm-virtual-ironic
job (195 hits over the last 7 days).

Change-Id: I0d1463c768b65eb5d4c147a0776f3c939b25834a
Related-bug: #1321494
Merge "Add a fingerprint for bug 1321494"