test: fix flaky ClientTest test

In brew, new stable version of Tarantool is 3.0.0. It has a new feature:
case-sensitive names in SQL. So let's make ClientTest version-independent
and call SQL columns in upper case.

Along the way, let's print response sql metadata in ClientTest - it will
make it easy to find a problem if the test fails.

test/ClientTest.cpp

@@ -123,6 +123,19 @@ printResponse(Response<BUFFER> &response, Data data = std::vector<UserTuple>())
 			  " code=" << err.errcode << std::endl;
 		return;
 	}
+	if (response.body.metadata != std::nullopt) {
+		std::cout << "RESPONSE SQL METADATA:" << std::endl;
+		for (const auto &column : response.body.metadata->column_maps) {
+			std::cout << "column=" << column.field_name <<
+				" type=" << column.field_type <<
+				" collation=" << column.collation <<
+				" is_nullable=" << column.is_nullable <<
+				" is_autoincrement" << column.is_autoincrement;
+			if (column.span.has_value())
+				std::cout << " span=" << column.span.value();
+			std::cout << std::endl;
+		}
+	}
 	if (response.body.data != std::nullopt) {
 		if (!response.body.data->decode(data)) {
 			std::cerr << "FAILED TO DECODE DATA" << std::endl;
@@ -750,8 +763,8 @@ single_conn_sql(Connector<BUFFER, NetProvider> &client)
 	fail_unless(rc == 0);
 
 	TEST_CASE("CREATE TABLE");
-	std::string stmt_str = "CREATE TABLE IF NOT EXISTS tsql (column1 UNSIGNED PRIMARY KEY, "
-			       "column2 VARCHAR(50), column3 DOUBLE);";
+	std::string stmt_str = "CREATE TABLE IF NOT EXISTS tsql (COLUMN1 UNSIGNED PRIMARY KEY, "
+			       "COLUMN2 VARCHAR(50), COLUMN3 DOUBLE);";
 	auto stmt = StmtProcessor::process(client, conn, stmt_str);
 	rid_t create_table = conn.execute(stmt, std::make_tuple());
 
@@ -848,8 +861,8 @@ single_conn_sql(Connector<BUFFER, NetProvider> &client)
 
 	TEST_CASE("CREATE TABLE with autoincrement and collation");
 	stmt_str = "CREATE TABLE IF NOT EXISTS tsql "
-		   "(column1 UNSIGNED PRIMARY KEY AUTOINCREMENT, "
-		   "column2 STRING COLLATE \"unicode\", column3 DOUBLE);";
+		   "(COLUMN1 UNSIGNED PRIMARY KEY AUTOINCREMENT, "
+		   "COLUMN2 STRING COLLATE \"unicode\", COLUMN3 DOUBLE);";
 	stmt = StmtProcessor::process(client, conn, stmt_str);
 	create_table = conn.execute(stmt, std::make_tuple());
 	client.wait(conn, create_table, WAIT_TIMEOUT);