[kong] add SAN to generated webhook certificate #312
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What this PR does / why we need it:
Add a SAN equal to the common name to the generated webhook certificate.
As of Go 1.15, certificates that contain a hostname CommonName and no
SubjectAlternativeName are considered invalid:
https://golang.org/cl/243221
Current versions of KIC use Go 1.15 and will complain without this.
Special notes for your reviewer:
Ref http://masterminds.github.io/sprig/crypto.html#gensignedcert for the syntax.
Once in next, we should cherry-pick into a 1.15.1 release also.
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