Add script that generates X509 certificates for testing dart:io SecureSocket

tests/standalone/io/certificates/server_chain.pem

Index: tests/standalone/io/certificates/server_chain.pem
diff --git a/tests/standalone/io/certificates/server_chain.pem b/tests/standalone/io/certificates/server_chain.pem
index 4163fe7dddf7cca1872b2675d2049013243ab8bf..c653fca015511b3b5a7c4def2150bf65acab3961 100644
--- a/tests/standalone/io/certificates/server_chain.pem
+++ b/tests/standalone/io/certificates/server_chain.pem
@@ -1,57 +1,57 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----