Empty ${RESOLV_MODS} was causing a deletion of config files in
  /etc/ppp/peers/*

  Resolves: #155

  Also, add a conflict for older versions of 'redhat-release'. Using
  them would cause unbootable system most likely...

  This is complete rework of how we generate the /etc/resolv.conf.

  Fixes:
   * always update 'nameserver' & 'search' entries when DNS* & DOMAIN
     options (respectively) were updated in ifcfg-* files
   * always update the order of 'nameserver' entries when the order of
     DNS* options was updated

  Enhancements:
   * added support for DNS3 option (equals to MAXNS value in GLIBC)
   * added logic to process duplicate DNS* options
   * added logic to process randomly omitted DNS* options (e.g. omitting
     DNS1 while specifying DNS2 and/or DNS3 will still work now)

  This work was based on these two RHEL-7.5 BZs:
  https://bugzilla.redhat.com/show_bug.cgi?id=1364895
  https://bugzilla.redhat.com/show_bug.cgi?id=1357658

  The symlinks are no longer needed. Enablement of default services
  is now managed by 'redhat-release' package.

  Resolves: #1395391
  Resolves: #1357648

  Otherwise obtaining IP from DHCP might fail. Based on patch from:
   * Rich Alloway <richard.alloway@roguewave.com> | CentOS BZ #0011138

  And network-scripts/network-functions was patched to use convert2sec().

  This function can be used to convert the value of its first parameter
  to a number of seconds - based on the time unit (specified as the
  second parameter).

  This is mostly useful for converting values for use with the sleep(1).