Move some mysql/mariadb utilities to maxutils

Can be used in system tests later on.

maxutils/maxsql/include/maxsql/CMakeLists.txt

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+install_header(mariadb.hh devel)
+install_header(ccdefs.hh devel)
+

maxutils/maxsql/include/maxsql/ccdefs.hh

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+/*
+ * Copyright (c) 2018 MariaDB Corporation Ab
+ *
+ * Use of this software is governed by the Business Source License included
+ * in the LICENSE.TXT file and at www.mariadb.com/bsl11.
+ *
+ * Change Date: 2022-01-01
+ *
+ * On the date above, in accordance with the Business Source License, use
+ * of this software will be governed by version 2 or later of the General
+ * Public License.
+ */
+
+#pragma once
+
+/**
+ * @file ccdefs.hh
+ *
+ * This file should be included first by all maxsql headers.
+ */
+
+#if !defined (__cplusplus)
+#error This file is only to be included by C++ code.
+#endif
+
+#include <maxbase/ccdefs.hh>
+
+/**
+ * All classes of MaxSql are defined in the namespace @c maxsql.
+ */
+namespace maxsql
+{
+}
+
+/**
+ * Shorthand for the @c maxsql namespace.
+ */
+namespace mxq = maxsql;

maxutils/maxsql/include/maxsql/mariadb.hh

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+/*
+ * Copyright (c) 2018 MariaDB Corporation Ab
+ *
+ * Use of this software is governed by the Business Source License included
+ * in the LICENSE.TXT file and at www.mariadb.com/bsl11.
+ *
+ * Change Date: 2022-01-01
+ *
+ * On the date above, in accordance with the Business Source License, use
+ * of this software will be governed by version 2 or later of the General
+ * Public License.
+ */
+#pragma once
+
+#include <maxsql/ccdefs.hh>
+#include <string>
+#include <mysql.h>
+
+namespace maxsql
+{
+/**
+ * Execute a query, manually defining retry limits.
+ *
+ * @param conn MySQL connection
+ * @param query Query to execute
+ * @param query_retries Maximum number of retries
+ * @param query_retry_timeout Maximum time to spend retrying, in seconds
+ * @return return value of mysql_query
+ */
+int mysql_query_ex(MYSQL* conn, const std::string& query, int query_retries, time_t query_retry_timeout);
+
+/**
+ * Check if the MYSQL error number is a connection error.
+ *
+ * @param Error code
+ * @return True if the MYSQL error number is a connection error
+ */
+bool mysql_is_net_error(unsigned int errcode);
+
+/**
+ * Enable/disable the logging of all SQL statements MaxScale sends to
+ * the servers.
+ *
+ * @param enable If true, enable, if false, disable.
+ */
+void mysql_set_log_statements(bool enable);
+
+/**
+ * Returns whether SQL statements sent to the servers are logged or not.
+ *
+ * @return True, if statements are logged, false otherwise.
+ */
+bool mysql_get_log_statements();
+}