[5325] Add d2_parsery.yy to dist source tree

src/bin/d2/Makefile.am
    Added EXTRA_DIST rule for d2_parser.yy

src/bin/d2/Makefile.am

@@ -24,6 +24,7 @@ CLEANFILES  = *.gcno *.gcda d2_messages.h d2_messages.cc s-messages
 man_MANS = kea-dhcp-ddns.8
 DISTCLEANFILES = $(man_MANS)
 EXTRA_DIST = $(man_MANS) kea-dhcp-ddns.xml dhcp-ddns.spec d2.dox
+EXTRA_DIST += d2_parser.yy
 
 EXTRA_DIST += images/abstract_app_classes.svg images/add_state_model.svg
 EXTRA_DIST += images/config_data_classes.svg images/config_from_file_sequence.svg