Update

Some updates, based on the results of my internal tests so far. These issues and quirks will reflected in
the final pull request, so I'm writing them down here:

• A new OperatingSystem family was added to handle NX-OS, mainly because the necessary scripts and DHCP options are very different from the other operating systems. I used the same solution that handles different DHCP options for Solaris and Junos.

• A new template type was also added for POAP, to help differentiate it from other provisioning tools.

• A dummy partition table template was added to keep things a little organized, since this seems to be a requirement. The switches never retrieve and never use them, however.

• Still thinking about ways to handle versions numbers, since the standard major/minor numbers from Foreman are not enough for Cisco releases.