Disable to request boot.iso compose
    
    When merging code to request boot.iso compose, we realized that boot.iso
    compose support is not deployed in ODCS server. So, this commit is for
    disabling the request at this moment for a while. Revert when the
    support is availabe in ODCS server.
    
    Signed-off-by: Chenxiong Qi <cqi@redhat.com>