storage-daemon: Call bdrv_close_all() on exit

Otherwise, exports and block devices are not properly shut down and
closed, unless the users explicitly issues blockdev-del and
block-export-del commands for each of them.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20201027190600.192171-17-mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

storage-daemon/qemu-storage-daemon.c

@@ -314,6 +314,9 @@ int main(int argc, char *argv[])
         main_loop_wait(false);
     }
 
+    bdrv_drain_all_begin();
+    bdrv_close_all();
+
     monitor_cleanup();
     qemu_chr_cleanup();
     user_creatable_cleanup();