MXS-1881: Add table creation method to RowEventHandler

The new method is called for each new CREATE TABLE statement that is
processed as well as all ALTER TABLE statemets that modify the table
structure.

Right now the entry point not in use but it opens up the possibility of
persisting the CREATE TABLE statements at creation time. Currently the
tables are only persisted when the first actual event for the table is
received.

server/modules/routing/avrorouter/rpl.hh

@@ -140,6 +140,12 @@ public:
     {
     }
 
+    // A table was created
+    virtual bool create_table(const STableCreateEvent& create)
+    {
+        return true;
+    }
+
     // A table was opened
     virtual bool open_table(const STableMapEvent& map, const STableCreateEvent& create)
     {
@@ -241,4 +247,5 @@ private:
     bool handle_row_event(REP_HEADER *hdr, uint8_t *ptr);
     STableCreateEvent table_create_copy(const char* sql, size_t len, const char* db);
     bool save_and_replace_table_create(STableCreateEvent created);
+    bool table_create_alter(STableCreateEvent create, const char *sql, const char *end);
 };