Perform query classifier initialization implicitly

The setting up and the initialization of the query classifier has
now been separated. The gateway explicitly sets up the query
classifier (i.e. chooses which one to use and what arguments to
provide), but the actual initialization is performed as part of
the general module initialization.

query_classifier/test/crash_qc_sqlite.c

@@ -41,7 +41,7 @@ int main()
 
     set_libdir(strdup("../qc_sqlite"));
 
-    if (qc_init("qc_sqlite", NULL))
+    if (qc_setup("qc_sqlite", NULL) && qc_process_init())
     {
         const char s[] = "SELECT @@global.max_allowed_packet";
 
@@ -53,7 +53,7 @@ int main()
         // code generator.
         qc_parse(stmt);
 
-        qc_end();
+        qc_process_end();
 
         rv = EXIT_SUCCESS;
     }