network-manager: generate configuration with netroot=
    
    If the root is on network, let nm-initrd-generator create configuration
    even if none was explicitly specified on the command line.
    
    Also do the same if /tmp/net.ifaces exists, because the anaconda plugin
    creates an empty file in that location in hopes that will make us
    configure the network.
    
    (cherry picked from commit 381ab6b7cd2d35bf7f9da63b10c20f5ef6e61a8b)
    
    patch_name: 0041.patch
    present_in_specfile: true
    location_in_specfile: 41
    squash_commits: true