wireprotov2: stop sending phase updates for base revisions This feature is broken and doesn't work properly in all scenarios. e.g. if we have the following DAGs: client server D draft C draft C draft B draft B public A public A public The current code would only send the phase data for C. The client wouldn't see that B moved from draft to public. This feature will be restored in a future commit. For now, it is making refactoring of how revisions are specified in the wire protocol a bit difficult... Differential Revision: https://phab.mercurial-scm.org/D4978

--- a/tests/test-wireproto-command-changesetdata.t	Thu Oct 11 09:47:52 2018 +0200
+++ b/tests/test-wireproto-command-changesetdata.t	Mon Oct 08 17:54:14 2018 -0700
@@ -426,6 +426,7 @@
   ]
 
 Base nodes have just their metadata (e.g. phase) transferred
+TODO this doesn't work
 
   $ sendhttpv2peer << EOF
   > command changesetdata
@@ -439,10 +440,6 @@
       b'totalitems': 3
     },
     {
-      b'node': b'3\x90\xef\x85\x00s\xfb\xc2\xf0\xdf\xff"D4,\x8e\x92)\x01:',
-      b'phase': b'public'
-    },
-    {
       b'fieldsfollowing': [
         [
           b'revision',