First stab at converting your kickstart

centos.pp

define community_kickstarts::centos (
  $rootpw                  = '--plaintext changeme',
  $url                     = 'http://mirror.centos.org/centos/7/os/x86_64',
  $architecture            = 'x86_64',
  $lang                    = 'en_US.UTF-8',
  $keyboard                = 'us',
  $network                 = '--onboot yes --device eth0 --bootproto dhcp --hostname kickstarted.example.com',
  $firewall                = '--service=ssh',
  $authconfig              = '--enableshadow --passalgo=sha512',
  $selinux                 = '--enforcing',
  $timezone                = '--utc Etc/UTC',
  $bootloader              = '--location=mbr --driveorder=sda --append="crashkernel=auto rhgb quiet"',
  $post_log                = '/root/ks-post.log',
  $post_fragments          = ['community_kickstarts/install_puppet.erb'],
  $puppet_repo             = 'https://yum.puppetlabs.com/el/7/products/x86_64/puppetlabs-release-7-11.noarch.rpm',
  $repos                   = {},
  $partition_configuration = {},
  $additional_packages     = [],
  $post_fragments          = [],
  $additional_commands     = {},
  $required_packages       = [
    '@core',
    '@server-policy',
    'ntpdate',
    'ntp',
    'wget',
    'screen',
    'git',
    'perl',
    'openssh-clients',
    'man',
    'system-config-network-tui',
    'mlocate',
    'bind-utils',
    'traceroute',
    'mailx',
  ],
) {

  $autopart  = empty($partition_configuration)
  $base_repo = { base => { baseurl => $url } }

  $commands = {
    install    => true,
    url        => $url,
    lang       => $lang,
    keyboard   => $keyboard,
    cmdline    => true,
    network    => $network,
    rootpw     => $rootpw,
    firewall   => $firewall,
    authconfig => $authconfig,
    selinux    => $selinux,
    timezone   => $timezone,
    autopart   => $autopart,
    bootloader => $bootloader,
    reboot     => true,
  }

  $fragments = {
    "post --log ${post_log}" => $post_fragments
  }

  ::kickstart { $name:
    packages                => unique(concat($additional_packages, $required_packages)),
    commands                => merge($commands, $additional_commands),
    partition_configuration => $partition_configuration,
    repos                   => merge($base_repo, $repos),
    fragments               => $fragments,
  }
}

[root@testbox modules]# puppet apply -e "community_kickstarts::centos{'/root/test.ks':}"
Notice: Compiled catalog for testbox.nelson.va in environment production in 0.74 seconds
Notice: /Stage[main]/Main/Community_kickstarts::Centos[/root/test.ks]/Kickstart[/root/test.ks]/File[/root/test.ks]/ensure: created
Notice: Finished catalog run in 0.02 seconds

[root@testbox modules]# cat /root/test.ks
### THIS FILE WAS GENERATED BY PUPPET ###

# Command Section
install
url http://mirror.centos.org/centos/7/os/x86_64
lang en_US.UTF-8
keyboard us
cmdline
network --onboot yes --device eth0 --bootproto dhcp --hostname kickstarted.example.com
rootpw --plaintext changeme
firewall --service=ssh
authconfig --enableshadow --passalgo=sha512
selinux --enforcing
timezone --utc Etc/UTC
autopart
bootloader --location=mbr --driveorder=sda --append="crashkernel=auto rhgb quiet"
reboot

# Package Repositories
repo --name base --baseurl http://mirror.centos.org/centos/7/os/x86_64


# Packages Section
%packages
@core
@server-policy
ntpdate
ntp
wget
screen
git
perl
openssh-clients
man
system-config-network-tui
mlocate
bind-utils
traceroute
mailx
%end

%post --log /root/ks-post.log
%end