Account for changes to struct dns_rbtnode

Commit 540a5b5a2c modified the definition
of struct dns_rbtnode.  Doing that changes the layout of map-format zone
files.  Bump MAPAPI and update the offsets used in map-format zone file
checks in the "masterformat" system test, as these changes were
inadvertently omitted from the aforementioned change.

bin/tests/system/masterformat/tests.sh

@@ -293,7 +293,7 @@ status=$((status + ret))
 echo_i "checking corrupt map files fail to load (bad node header) ($n)"
 ret=0
 cp map.5 badmap
-stomp badmap 3706 2 99
+stomp badmap 3578 2 99
 $CHECKZONE -D -f map -F text -o text.5 example.nil badmap >/dev/null
 [ $? = 1 ] || ret=1
 n=$((n + 1))
@@ -303,7 +303,7 @@ status=$((status + ret))
 echo_i "checking corrupt map files fail to load (bad node data) ($n)"
 ret=0
 cp map.5 badmap
-stomp badmap 3137 5 127
+stomp badmap 3057 5 127
 $CHECKZONE -D -f map -F text -o text.5 example.nil badmap >/dev/null
 [ $? = 1 ] || ret=1
 n=$((n + 1))

lib/dns/mapapi

@@ -13,4 +13,4 @@
 # Whenever releasing a new major release of BIND9, set this value
 # back to 1.0 when releasing the first alpha.  Map files are *never*
 # compatible across major releases.
-MAPAPI=4.0
+MAPAPI=5.0