Robert C Jennings 52e5a2b25b Allow hooks to replace generic snap assertion
The generic assertion will be put in place if there are preseeded snaps.
A hook that wants to add its own model should be able to overwrite
the generic assertion.  This patch allows a hook to continue unchanged
calling snap_prepare_assertions with a custom brand/model.  The patch
will replace the generic brand/model if a custom brand/model is specified.
Prior to this patch the generic brand/model would remain in place.
2018-09-27 11:36:53 -05:00
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