configure tftp root folder for RHEL8

[fchioralia]

When daemon true in RedHat family greater then 8, the tftpd service is started with the default root folder.
A little patch if you want to configure other folder:
Using systemd: 'https://github.com/camptocamp/puppet-systemd'
in config.pp line 15 add:
if $facts['os']['family'] =~ /^(RedHat)$/ {
if versioncmp($facts['os']['release']['major'], '8') == 0 {
systemd::unit_file { 'tftp.service':
content => "
[Unit]
Description=Tftp Server
Requires=tftp.socket
Documentation=man:in.tftpd

[Service]
ExecStart=/usr/sbin/in.tftpd -s ${tftp::root}
StandardInput=socket

[Install]
Also=tftp.socket
",
}
}
}