dracut-module-setup: Apply the manual DNS to the 2nd kernel
    
    Now Kdump will ingore the DNS config in /etc/resolv.conf, when it
    generates the initram. And most users do not concern about this issue,
    because they never use deployment tools to configure machines
    environment, like puppet.
    
    It is more convenient to add the DNS config to /etc/resolv.conf for
    people who use deployment tools to configure machines concurrently.
    
    Signed-off-by: Minfei Huang <mhuang@redhat.com>
    Acked-by: Dave Young <dyoung@redhat.com>
    Acked-by: Baoquan He <bhe@redhat.com>