The problem is on this line in ipautil.CheckedIPAddress with the 
netmask=ifdata['netmask'] call

    ifnet = netaddr.IPNetwork('{addr}/{netmask}'.format(
          addr=ifaddr,
          netmask=ifdata['netmask']
          ))

On my CentOS 7.3 box which has python-netifaces-0.10.4-3.el7.x86_64 it works

On my CentOS 7.4 box where I am trying to install 
ipa-server-4.5.0-22.el7.centos.x86_64 and it has 
python2-netifaces-0.10.5-2.el7_4.x86_64 installed, it fails with:

ValueError: IPAddress() does not support netmasks or subnet prefixes! See 
documentation for details.

So I don't see how anyone has been able to install ipa-server on a RedHat 7.4 
or CentOS 7.4 box

Might be related to this:

https://bitbucket.org/al45tair/netifaces/issues/50/netmask-format-of-ipv6-address-is-not
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