spec file: bump python-netaddr Requires
Bump python-netaddr Requires to the version which has correct private and
reserved IPv4 address ranges.
This fixes DNS server install failure when 0.0.0.0 is entered as a
forwarder.
Backport from: 0784e53f7f8a323acafbbff26a9d1c0276a229b0
https://pagure.io/freeipa/issue/6894
Reviewed-By: Tomas Krizek <tkrizek@redhat.com>