tests: Use SSL by default for test connections.

Author: rsomla1

testing/test.h

@@ -107,9 +107,7 @@ class Xplugin : public ::testing::Test
           m_sess = new mysqlx::Session(
             SessionOption::PORT, m_port,
             SessionOption::USER, m_user,
-            SessionOption::PWD, m_password,
-            // TODO: Use SSL connection by default?
-            SessionOption::SSL_MODE, SSLMode::DISABLED
+            SessionOption::PWD, m_password
           );
         }
         catch (const Error &e)