Fix analytics systemless test. (1) In verify_tracebuffer_in_analytics_db(), 'Messagetype' in select_fields should have been 'Type' (2) In PostProcessing::process_query(), in the iteration of the filter_list, if the filter field is not present in the result_row and if ignore_col_absence is set,, we should continue instead of break

Change-Id: I5387cde9605d069d20201b3876eb35c55f3c37ea