network-manager: install libnss DNS and mDNS plugins
    
    Install libnss_dns.so and libnss_mdns4_minimal.so plugins for the Name
    Service Switch (NSS) functionality of glibc so that name resolution
    through /etc/resolv.conf and mDNS works in the initrd.
    
    Fixes: #772
    
    Cherry-picked from: 87bffc36e72c121024df033e1a78799456c73523
    Resolves: #1826061
    
    patch_name: 0073.patch
    present_in_specfile: true
    location_in_specfile: 73
    squash_commits: true