After slave Lua script leaves busy state, re-process the master buffer.

Technically speaking we don't really need to put the master client in
the clients that need to be processed, since in practice the PING
commands from the master will take care, however it is conceptually more
sane to do so.

src/networking.c

@@ -827,8 +827,7 @@ void freeClient(client *c) {
         serverLog(LL_WARNING,"Connection with master lost.");
         if (!(c->flags & (CLIENT_CLOSE_AFTER_REPLY|
                           CLIENT_CLOSE_ASAP|
-                          CLIENT_BLOCKED|
-                          CLIENT_UNBLOCKED)))
+                          CLIENT_BLOCKED)))
         {
             replicationCacheMaster(c);
             return;

src/scripting.c

@@ -1367,6 +1367,10 @@ void evalGenericCommand(client *c, int evalsha) {
          * script timeout was detected. */
         aeCreateFileEvent(server.el,c->fd,AE_READABLE,
                           readQueryFromClient,c);
+        if (server.masterhost && server.master) {
+            server.master->flags |= CLIENT_UNBLOCKED;
+            listAddNodeTail(server.unblocked_clients,server.master);
+        }
     }
     server.lua_caller = NULL;