Merge two of the room join codepaths

There's at least one more to merge in.

Side-effects:
 * Stop reporting None as displayname and avatar_url in some cases
 * Joining a room by alias populates guest-ness in join event
 * Remove unspec'd PUT version of /join/<room_id_or_alias> which has not
   been called on matrix.org according to logs
 * Stop recording access_token_id on /join/room_id - currently we don't
   record it on /join/room_alias; I can try to thread it through at some
   point.

synapse/handlers/profile.py

@@ -169,8 +169,15 @@ class ProfileHandler(BaseHandler):
             consumeErrors=True
         ).addErrback(unwrapFirstError)
 
-        state["displayname"] = displayname
-        state["avatar_url"] = avatar_url
+        if displayname is None:
+            del state["displayname"]
+        else:
+            state["displayname"] = displayname
+
+        if avatar_url is None:
+            del state["avatar_url"]
+        else:
+            state["avatar_url"] = avatar_url
 
         defer.returnValue(None)