Support for Installation of FreeIPA-Server in Debian-OS family.

• Include a if-statement based on facts['os']['family']
  • In Install.pp -> install respective dns_packages (freeipa-server-dns, bind9-dyndb-ldap for Debian and ipa-server-dns, bind-dyndb-ldap for CentOS/ Fedora)
  • In Server.pp -> Ensure running of apache2 server and httpd server in Debian and CentOS/ Fedora respectively. -> Code for Resolving https://bugs.launchpad.net/ubuntu/+source/freeipa/+bug/1772205 -> Code for Resolving https://lists.fedorahosted.org/archives/list/freeipa-users@lists.fedorahosted.org/thread/PEAN25LXV5BLWOBTU3XJD2SA3NXS6LZZ/

Was able to successfully test the Installation of FreeIPA Server 4.8.3 on Ubuntu 18.04 LTS