Increase timeout from 5 to 15 seconds

... as suggested by Junie in #1095

Author: chrjohn

quickfixj-core/src/test/java/quickfix/mina/ssl/SSLCertificateTest.java

@@ -1009,7 +1009,7 @@ public void shouldConnectDifferentTypesOfSessions() throws Exception {
 
     static abstract class TestConnector {
         private static final Logger LOGGER = LoggerFactory.getLogger(TestConnector.class);
-        private static final int TIMEOUT_SECONDS = 5;
+        private static final int TIMEOUT_SECONDS = 15;
 
         private final SessionConnector connector;
         private final CountDownLatch exceptionThrownLatch;