issue #223: correctly detect if reversible data have to be removed after hived restart

• now fork event is added only when hived wills end notification, no artificial event during 'hive.connect'
• hive.connect is always executed before on_reindex notification, before data are marked as dirty

src/sql_serializer/indexation_state.cpp

@@ -442,6 +442,7 @@ indexation_state::on_irreversible_block( uint32_t block_num ) {
 
 void
 indexation_state::on_switch_fork( cached_data_t& cached_data, uint32_t block_num ) {
+  ilog( "MICKIEWICZ: fork event!!" );
   if ( _state != INDEXATION::P2P ) {
     return;
   }