Add support for client certificates to Secure[Server]Socket

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 c653fca015511b3b5a7c4def2150bf65acab3961..ff6e5685eddb84cfab7369748117cf844c1cc8fc 100644
--- a/tests/standalone/io/certificates/server_chain.pem
+++ b/tests/standalone/io/certificates/server_chain.pem
@@ -1,57 +1,59 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----