fixes #3752 - move data population from migrations into seed script

fixes #3239 - pxelinux spoofing on postgres now works

Fixes #623 - incomplete multiple builds commit

Signed-off-by: Paul Kelly <paul.ian.kelly@googlemail.com>

Fixes #592 - Adding tests for provisioning template selection based on Host

Fixes #378 - Adds support for multiple configuration templates

Configuration templates (Kickstart, preseed, syslinux, gpxe etc) can now
be saved in the database directly.

Each template is associated with valid operating systems (unless if its a
snippet which can rendered via all other templates) and a possible...