Update demo.

Use new SSL_CONF options in demo. Add intermediate and root CAs and
update all to use SHA256.
Reviewed-by: NViktor Dukhovni <viktor@openssl.org>

demos/bio/accept.cnf

@@ -11,3 +11,9 @@ ECDHParameters = Automatic
 SignatureAlgorithms = RSA+SHA512:ECDSA+SHA512 
 Certificate=server.pem
 PrivateKey=server.pem
+ChainCAFile=root.pem
+VerifyCAFile=root.pem
+
+# Request certificate
+VerifyMode=Request
+ClientCAFile=root.pem

demos/bio/intca.pem

+-----BEGIN CERTIFICATE-----
+MIIDvjCCAqagAwIBAgIJAPzCy4CUW9/qMA0GCSqGSIb3DQEBCwUAMGgxCzAJBgNV
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+thI=
+-----END CERTIFICATE-----

demos/bio/root.pem

+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

demos/bio/server.pem

 subject= C = UK, O = OpenSSL Group, OU = FOR TESTING PURPOSES ONLY, CN = Test Server Cert
 issuer= C = UK, O = OpenSSL Group, OU = FOR TESTING PURPOSES ONLY, CN = OpenSSL Test Intermediate CA
 -----BEGIN CERTIFICATE-----
-MIID5zCCAs+gAwIBAgIJALnu1NlVpZ6zMA0GCSqGSIb3DQEBBQUAMHAxCzAJBgNV
+MIIDpTCCAo2gAwIBAgIJAK8ArbvjIOQlMA0GCSqGSIb3DQEBCwUAMHAxCzAJBgNV
 BAYTAlVLMRYwFAYDVQQKDA1PcGVuU1NMIEdyb3VwMSIwIAYDVQQLDBlGT1IgVEVT
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@@ -13,15 +13,14 @@ R7bfSdI/+qIQt8KXRH6HNG1t8ou0VSvWId5TS5Dq/er5ODUr9OaaDva7EquHIcMv
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 -----END CERTIFICATE-----
 -----BEGIN RSA PRIVATE KEY-----
 MIIEpAIBAAKCAQEA84TzkjbcskbKZnrlKcXzSSgi07n+4N7kOM7uIhzpkTuU0HIv