Skip class types with changed names in leaf reports

Skip class types with changed names in leaf reports

In leaf reports, a class type which is said to have changed name
should not be reported because it doesn't make sense there.  In the
full report however, a class sub-type of a type foo changed name is
worth mentioning.

This patch detects name changes of class types in the context of leaf
reports and avoid reporting impacted types.

	* include/abg-comp-filter.h (has_class_or_union_type_name_change)
	(has_basic_or_class_type_name_change): Declare new functions.
	* include/abg-comparison.h (is_diff_of_class_or_union_type):
	Likewise.
	* src/abg-comp-filter.cc (has_class_or_union_type_name_change)
	(has_basic_or_class_type_name_change):
	* src/abg-comparison.cc
	(leaf_diff_node_marker_visitor::visit_begin): Use the new
	filtering::has_basic_or_class_type_name_change to test if a basic
	or class/union diff type carries a name change.  Update comment.
	* tests/data/test-diff-pkg/spice-server-0.12.4-19.el7.x86_64-0.12.8-1.el7.x86_64-report-3.txt:
	Adjust.

Signed-off-by: Dodji Seketeli <dodji@redhat.com>