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/avro_schema.cc

@@ -1131,7 +1131,7 @@ static bool not_column_operation(const char* tok, int len)
     return false;
 }
 
-bool table_create_alter(TableCreateEvent *create, const char *sql, const char *end)
+bool Rpl::table_create_alter(STableCreateEvent create, const char *sql, const char *end)
 {
     const char *tbl = strcasestr(sql, "table"), *def;
 
@@ -1250,6 +1250,15 @@ bool table_create_alter(TableCreateEvent *create, const char *sql, const char *e
         {
             create->version++;
             create->was_used = false;
+
+            /**
+             * Although the table was only altered, we can treat it like it
+             * would have been just created. This allows for a minimal API that
+             * only creates and replaces tables.
+             *
+             * TODO: Add DROP TABLE entry point for pruning old tables
+             */
+            m_handler->create_table(create);
         }
     }