Update to v2.0 of Appendix D & other updates

[smartbit]

Update to match Appendix D 2.0.pdf and be consistent in the labs eg.

• 192.168.4.0/24 instead of 192.168.122.0/24
• only use primary DNS 8.8.8.8, removed secondary 8.8.4.4 (although this is not a best practice)

Other items

• added haveged to speedup install of FreeIPA
• added bash-completion to assist with those pesky nmclicommands
• install EPEL and update cache-proxy with epel-mirrors and allow https
• use dynamic CentOS mirrors list
• lower case freeipa for consistency on vagrant command line

[AnwarYagoub]

Hello @smartbit & thanks for contributing in this project. i will be more than happy to accept this PR but why removing the secondary the secondary DNS.

[smartbit]

Hi Anwar, I haven't done all exercises so I can't say what the impact might be other that the exercises will be different. Appendix D v2.0 mentions setting DNS temporarily to 8.8.8.8 and at 19) to remove it again and point to the internal DNS 192.168.4.200. Adding secondary DNS adds confusion and I try to follow the KISS principle.

Now we talk about it, I think the two ethernet controllers might be confusing too. Maybe we can come up with a vagrant setup with 192.168.4.0/24 and NATing at the same time. With manual installing CentOS this is possible. Sander is using VMware Fusion, which has different network topology than VirtualBox.

[AnwarYagoub]

I have added the secondary if someone wanted to use other DNS servers than the one used in this exercises, but removing the secondary DNS will match the environment with the description from Appendix D so no problem removing it.

As for network controllers Interface eth0 in NAT interface while interface eth1 in used for 192.168.4.0/24 network. is it possible to do both using the same controller? i don't know.