Don't reject "ctl.stop.*" during shutdown.

We're shutting down anyway, so the service is either dead already
or about to be killed, and callers get upset (and don't have a good
response themselves) if we reject the request.

This was seen by a partner where adbd was asked to stop during
shutdown.

Bug: https://issuetracker.google.com/336223505
Change-Id: If09feeef2e0f2d1be9ff84a88cca6ed593a35362
diff --git a/init/property_service.cpp b/init/property_service.cpp
index 5a1b63b..d02ca1e 100644
--- a/init/property_service.cpp
+++ b/init/property_service.cpp
@@ -453,6 +453,10 @@
                                    SocketConnection* socket, std::string* error) {
     auto lock = std::lock_guard{accept_messages_lock};
     if (!accept_messages) {
+        // If we're already shutting down and you're asking us to stop something,
+        // just say we did (https://issuetracker.google.com/336223505).
+        if (msg == "stop") return PROP_SUCCESS;
+
         *error = "Received control message after shutdown, ignoring";
         return PROP_ERROR_HANDLE_CONTROL_MESSAGE;
     }