bvmhost-a64-16 becomes openqa-a64-worker04
    
    This new arm box was going to be for staging, but we are ok with the old
    out of warentee emag there for now while we ask for more replacements.
    Moving this to openqa could help us keep up on aarch64 testing.
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>