MXS-2008 Update gateway and tests to initialize maxbase

Update gateway and tests to initialize maxbase using

  maxbase::init();

instead of initializing individual components.

query_classifier/test/crash_qc_sqlite.cc

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2016 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.
+ */
+
+#include <stdio.h>
+#include <maxbase/maxbase.hh>
+#include <maxscale/buffer.h>
+#include <maxscale/paths.h>
+#include <maxscale/query_classifier.h>
+
+#define MYSQL_HEADER_LEN 4
+
+GWBUF* create_gwbuf(const char* s, size_t len)
+{
+    size_t payload_len = len + 1;
+    size_t gwbuf_len = MYSQL_HEADER_LEN + payload_len;
+
+    GWBUF* gwbuf = gwbuf_alloc(gwbuf_len);
+
+    *((unsigned char*)((char*)GWBUF_DATA(gwbuf))) = payload_len;
+    *((unsigned char*)((char*)GWBUF_DATA(gwbuf) + 1)) = (payload_len >> 8);
+    *((unsigned char*)((char*)GWBUF_DATA(gwbuf) + 2)) = (payload_len >> 16);
+    *((unsigned char*)((char*)GWBUF_DATA(gwbuf) + 3)) = 0x00;
+    *((unsigned char*)((char*)GWBUF_DATA(gwbuf) + 4)) = 0x03;
+    memcpy((char*)GWBUF_DATA(gwbuf) + 5, s, len);
+
+    return gwbuf;
+}
+
+int main()
+{
+    int rv = EXIT_FAILURE;
+
+    maxbase::MaxBase init(MXB_LOG_TARGET_FS);
+
+    set_libdir(strdup("../qc_sqlite"));
+
+    if (qc_setup(NULL, QC_SQL_MODE_DEFAULT, "qc_sqlite", NULL) &&
+        qc_process_init(QC_INIT_BOTH) &&
+        qc_thread_init(QC_INIT_BOTH))
+    {
+        const char s[] = "SELECT @@global.max_allowed_packet";
+
+        GWBUF *stmt = create_gwbuf(s, sizeof(s)); // Include superfluous NULL.
+
+        // In 2.0.1 this crashed due to is_submitted_query() in qc_sqlite.c
+        // being of the opinion that the statement was not the one to be
+        // classified and hence an alien parse-tree being passed to sqlite3's
+        // code generator.
+        qc_parse(stmt, QC_COLLECT_ALL);
+
+        qc_process_end(QC_INIT_BOTH);
+
+        rv = EXIT_SUCCESS;
+    }
+    else
+    {
+        fprintf(stderr, "error: Could not load query classifier.");
+    }
+
+    return rv;
+}