Move devel/etcd3 to devel/etcd31.

MOVED

@@ -9458,3 +9458,4 @@ net/abills||2017-07-01|Removed, unmaintained and depends on expired net/freeradi
 net-mgmt/ezradius||2017-07-01|Removed, unmaintained and depends on expired net/freeradius2
 x11-toolkits/qt5-declarative||2017-07-01|Has expired: Has not been released since Qt 5.5 -- installation can lead to runtime conflicts with qt5-quick
 deskutils/california|deskutils/gnome-calendar|2017-07-02|Has expired: Orphaned upstream, replaced by gnome-calendar
+devel/etcd3|devel/etcd31|2017-07-07|Version 3.2 introduces breaking changes

devel/Makefile

@@ -568,7 +568,7 @@
     SUBDIR += erlang-unicode_util_compat
     SUBDIR += es-eric6
     SUBDIR += etcd
-    SUBDIR += etcd3
+    SUBDIR += etcd31
     SUBDIR += etl
     SUBDIR += euca2ools
     SUBDIR += eventxx