Update git submodules
Update git submodules

* Update plugins/download-commands from branch 'stable-2.15'
  - Merge branch 'stable-2.14' into stable-2.15
    
    * stable-2.14:
      CloneWithCommitMsgHook: Stop passing --insecure to curl
    
    Change-Id: I4ff216985885be55959a79f430ee1894fb5ba1d7
    
  - CloneWithCommitMsgHook: Stop passing --insecure to curl
    
    Validating certs is an important feature of HTTPS that we should not
    disable, especially when downloading code that is going to be trusted.
    
    This "curl" invocation does not take place until after a successful
    "git clone", so the -k option would not be useful for dealing with
    misconfigured https servers.  Any configuration that needs -k would
    already be broken because of the "git clone" that comes before it.
    
    Reported-by: Gert van Dijk <gertvdijk@gmail.com>
    Bug: Issue 7562
    Change-Id: Ibe14bba5c1ce30a771515ff7985796aa1b8cdadf
    
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