Allow query classifier to initialize itself

The process and thread initialization/finalization of the query
classifier plugins is handled using the process and thread
initialization/finalization functions in the module object.

However, the top-level query classifier will also need to perform
process and thread initialization when transaction boundaries are
detected using regular expressions.

query_classifier/test/crash_qc_sqlite.c

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