tests: regenerate x509 test certificates
The old x509 test certificates were using cryptographic settings
that are ancient by today's standards, namely 512 bit RSA keys.
To put things in perspective, browsers have been dropping support
for 1024 bit RSA keys.
I think it is important that tests match the realities of the times.
And 2048 bit RSA keys with SHA-2 hashing are what the world is
moving to.
This patch replaces all the x509 certificates with new versions using
modern best practices. In addition, the docs for generating the
keys have been updated, as the existing docs left out a few steps,
namely how to generate certs that were not active yet or expired.
-----BEGIN CERTIFICATE-----
MIIDNTCCAh2gAwIBAgIJAJ12yUL2zGhzMA0GCSqGSIb3DQEBCwUAMDExEjAQBgNV
BAMMCWxvY2FsaG9zdDEbMBkGCSqGSIb3DQEJARYMaGdAbG9jYWxob3N0MB4XDTE2
MDcxMzA0MTcxMloXDTQxMDMwNDA0MTcxMlowMTESMBAGA1UEAwwJbG9jYWxob3N0
MRswGQYJKoZIhvcNAQkBFgxoZ0Bsb2NhbGhvc3QwggEiMA0GCSqGSIb3DQEBAQUA
A4IBDwAwggEKAoIBAQDZSC3uNCsP674m0h9dmlV6nM4C59xfgIygdX3mpldmaXaO
4anHdPvCNA8H8g+g6lEb0KgJp6Qor5sipBfWo26JRrYKypyE1By5raOzkNO22ZFg
L5/AdpBzRRjVAp7/Svw0VfVeh4hZ+4v7RQARGgjXOaG72nHnfboLs+jIE8i5tPR6
MtUt9yIWDIcOaq9ga7pxQGk0WsCLxyw80ZzKJ7UDGHTBn/2O8d036IaZpX0Zk5sa
/QZmltaUmbx8b6YfWowVgDqaeSclsQEFOdXQhZ0YlqUafP7kZ8K+HHNhwRaYsN47
/sU2tYxVP0vwrLrlzKAJ4niURbVcHXD/qtBiNpKfAgMBAAGjUDBOMB0GA1UdDgQW
BBT6fA08JcG+SWBN9Y+p575xcFfIVjAfBgNVHSMEGDAWgBT6fA08JcG+SWBN9Y+p
575xcFfIVjAMBgNVHRMEBTADAQH/MA0GCSqGSIb3DQEBCwUAA4IBAQCzJhM/OBoS
JXnjfLhZqi6hTmx1XC7MR05z4fWdyBhZx8PwSDEjxAj/omAm2RMEx/Fv1a7FO6hd
ClYsxxSfWJO7NQ3V4YLn9AvNr5gcxuXV/4bTtEFNebuzhV06u5nH7pGbHbkxCI+u
QekmRTvKIojr8F44cyszEk+MZQ5bFBElByjVzgXNvAaDP0ryUL5eQhLrkuwbNFLQ
mFf7EaerMuM28x1knhiH/39s7t92CJgm9+D60TmJ4XXwue1gZ0v9MVS18iOuWyio
BklppJsdtDLxHTHGNlBeHdam5VejbXRo7s0y5OfuATwlgcaCMYC/68hVJYwl/GZ7
3YpdNpMshSaE
-----END CERTIFICATE-----