Update git submodules

* Update plugins/download-commands from branch 'master'
  to 5bd359c08e10b93d2c08762f75cde01a14e45fc6
  - use unqiue constants for each download command
    
    Since these are used to record user preferences, make sure each one
    is unique and we don't re-use existing ones.
    
    Change-Id: I4cea0f1ac22d70db9211c05edd633dfb98713560
    
diff --git a/plugins/download-commands b/plugins/download-commands
index cfa03bc..5bd359c 160000
--- a/plugins/download-commands
+++ b/plugins/download-commands
@@ -1 +1 @@
-Subproject commit cfa03bc5e7a7e1e27b83f2dba60e9a9eb7c8f4aa
+Subproject commit 5bd359c08e10b93d2c08762f75cde01a14e45fc6