Serial and console form factors

[explody]

Fixes:

Addresses #167 though I could add a new issue if preferred

This PR adds two enhancements

• 3 Additional form factors for serial network interfaces

  • DE9
  • DB25
  • RJ45

• Adds form factor selection for console ports and console server ports as well as their related templates.

  • RJ45
  • DE9
  • DB25
  • USB to Serial
  • Micro USB to Serial
  • Mini USB to Serial
  • KVM

The rationale here is that even now, there are machines with call-home on landlines that use serial-to-modem for that connection. In particular, door access control systems and the like in our DCs and telco spaces often have old or unusual connections. The added serial types cover the most common.

For the console port form factors, it is because we determined that nearly every device we found has one or more console ports, but not all the same type or quantity of each. Specifying a FF for the console connections allows a user to more thoroughly plan interconnections between devices such as with network, without, IMHO, bogging down in too much detail.

I added the FF to the console port table, but I did not enable bulk editing since there's really only the one setting per port. Might make sense later if it were worthwhile to record baud rate or other serial settings.

[explody]

Forgot the migration, I'll resubmit

[explody]

Added forgotten migration as well as template fix to properly display console port FF on the device page.

[jeremystretch]

Thanks for taking a stab at this, but this requires a new feature request be opened for discussion before any PR can be accepted.