Send an initial status update notification on bind().

When the client calls bind(), this patch now sends an initial status
update so the client can react to the status update that could have
been sent before it called bind().

Bug: 27108108
TEST=`update_engine_client --follow` shows the initial status.

Change-Id: Ifbf056ebb66da17c9e60244561340b3e1ccd4232
diff --git a/update_attempter_android.cc b/update_attempter_android.cc
index 561534c..f7bcab1 100644
--- a/update_attempter_android.cc
+++ b/update_attempter_android.cc
@@ -86,9 +86,9 @@
   // In case of update_engine restart without a reboot we need to restore the
   // reboot needed state.
   if (UpdateCompletedOnThisBoot())
-    status_ = UpdateStatus::UPDATED_NEED_REBOOT;
+    SetStatusAndNotify(UpdateStatus::UPDATED_NEED_REBOOT);
   else
-    status_ = UpdateStatus::IDLE;
+    SetStatusAndNotify(UpdateStatus::IDLE);
 }
 
 bool UpdateAttempterAndroid::ApplyPayload(