MXS-1677: Add test case

Added test case that reproduces the problem and verified that it is fixed.

maxscale-system-test/mxs1677_temp_table.cpp

@@ -0,0 +1,18 @@
+/**
+ * MXS-1677: Error messages logged for non-text queries after temporary table is created
+ *
+ * https://jira.mariadb.org/browse/MXS-1677
+ */
+#include "testconnections.h"
+
+int main(int argc, char** argv)
+{
+    TestConnections test(argc, argv);
+
+    test.maxscales->connect();
+    test.try_query(test.maxscales->conn_rwsplit[0], "CREATE TEMPORARY TABLE test.temp(id INT)");
+    test.maxscales->disconnect();
+
+    test.check_log_err(0, "The provided buffer does not contain a COM_QUERY, but a COM_QUIT", false);
+    return test.global_result;
+}