Fix SslCertLookupTable to correctly determine whether we have a valid cached decision

We should only re-use a cached 'allow' decision if the decision ...
- is for the same host
- is for an error which is at least as severe as the current error

Bug: 5409251
Change-Id: Id8516f58c8d23de44e80539ffeaf945be3d2914a
1 file changed