new C/C and --ssl-verify-server-cert tests

tests for --ssl-verify-server-cert with system CA
and with incorrect hostname

libmariadb @ 8e9c3116

-Subproject commit a1283d0b10a3b675bede48d9fe2d082865a24a6c
+Subproject commit 8e9c3116105d9a998a60991b7f4ba910d454d4b1

mysql-test/r/ssl_system_ca,bad.result

+ERROR 2026 (HY000): SSL connection error: Validation of SSL server certificate failed

mysql-test/r/ssl_system_ca.result

+*************************** 1. row ***************************
+have_ssl: 1

mysql-test/t/ssl_system_ca.combinations

+[good]
+#
+# hostname on the certificate is localhost
+#
+
+[bad]
+#
+# hostname on the certificate is server8k
+#
+loose-ssl-key=$MYSQL_TEST_DIR/std_data/server8k-key.pem
+loose-ssl-cert=$MYSQL_TEST_DIR/std_data/server8k-cert.pem

mysql-test/t/ssl_system_ca.test

+#
+# Tests here don't use --ssl-ca but expect the certificate to be
+# signed by a CA in a system CA store
+#
+# They only work for openssl, because the following line works only there:
+let SSL_CERT_DIR=$MYSQL_TMP_DIR;
+
+if (`select @@version_ssl_library not like 'OpenSSL%'`) {
+  skip Needs OpenSSL;
+}
+
+# See `openssl x509 -in cacert.pem -noout -issuer_hash`
+copy_file $MYSQL_TEST_DIR/std_data/cacert.pem $MYSQL_TMP_DIR/ed1f42db.0;
+
+#
+# test --ssl-verify-server-cert
+#
+
+disable_abort_on_error;
+exec $MYSQL --ssl-verify-server-cert -Ee "select (variable_value <> '') as have_ssl from information_schema.session_status where variable_name='ssl_cipher'" 2>&1;