Updates the certificates to account for current versions of Go expecting
SANs to be used instead of the Common Name field:
FAIL: s390x.integration.plugin.authz TestAuthZPluginTLS (0.53s)
[2020-07-26T09:36:58.638Z] authz_plugin_test.go:132: assertion failed:
error is not nil: error during connect: Get "https://localhost:4271/v1.41/version":
x509: certificate relies on legacy Common Name field, use SANs or temporarily enable Common Name matching with GODEBUG=x509ignoreCN=0
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>