Update git submodules

* Update plugins/download-commands from branch 'master'
  to 3f5a024fd46f30f4646bfceb285763e44fda15a7
  - Add a checkout+branch command
    
    Bug: Issue 11609
    Change-Id: Ic8307132782e42b58a1652b8975176730b2f86c0
    
diff --git a/plugins/download-commands b/plugins/download-commands
index 48e143a..3f5a024 160000
--- a/plugins/download-commands
+++ b/plugins/download-commands
@@ -1 +1 @@
-Subproject commit 48e143ad2dd5b4e4dffaa6646ac826b4e38083ce
+Subproject commit 3f5a024fd46f30f4646bfceb285763e44fda15a7