libdm: report: implement DM_REPORT_GROUP_BASIC for extended report output

This patch introduces DM_REPORT_GROUP_BASIC report group type. This
type has exactly the classical output format as we know from before
introduction of report groups. However, in addition to that, it allows
to put several reports into a group - this is the very basic grouping
scheme that doesn't change the output format itself:

  Report: report1_name
  Header1  Header2 ...
  value    value   ...
  value    value   ...
  ...      ...     ...

  Report: report2_name
  Header1  Header2 ...
  value    value   ...
  value    value   ...
  ...      ...     ...

1 files changed, 1 insertions, 0 deletions

diff --git a/libdm/libdevmapper.h b/libdm/libdevmapper.h
index c99ebe878..fbe432298 100644
--- a/libdm/libdevmapper.h
+++ b/libdm/libdevmapper.h
@@ -2710,6 +2710,7 @@ struct dm_report_group;
 
 typedef enum {
 	DM_REPORT_GROUP_SINGLE,
+	DM_REPORT_GROUP_BASIC
 } dm_report_group_type_t;
 
 struct dm_report_group *dm_report_group_create(dm_report_group_type_t type, void *data);