warewulf v4 WIP

This is built on CentOS-7/8. More needs to be done to make it work on other distributions and versions specifically with the system service components.

In a nutshell, to install and start provisioning nodes, do the following:

1. Build Warewulf and dependencies:

   make all

2. Install Warewulf onto your host system:

   sudo make install

3. Set the master's kernel and default VNFS into your "default" node profile:

   sudo ./wwctl profile set -K $(uname -r) -V docker://warewulf/centos-8 default

4. Build the kernel, VNFS, and overlays:

   sudo ./wwctl kernel build -a

   sudo ./wwctl vnfs build -a

   sudo ./wwctl overlay build -sa

5. Start the Warewulf daemon:

   ./warewulfd

6. Boot your compute node and watch it boot