store all certificates, resolve the longer-lived ones #1115
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Until now, Sōzu replaces shorter-lived certificates when adding a new one.
This behaviour is imperfectly implement, and leads occasionnaly to confusing behaviours: a certificate with 2 domain names would be removed by a 1-domain-name certificate, leaving one of the domain names unresolved.
Instead of fixing the replacement of certificates, this PR changes the behaviour of the
CertificateResolver
: