Option to reverse the rack numbering

[Nyanya]

Currently the rack maintenance plugin only allows rack numbering starting from the number 1 at the top of the rack, and increases this number downwards.

A feature to reverse rack numbering so that 1 is labelled at the bottom of the rack and increases towards the top of the rack is desirable. If it could be implemented in such a way that servers already labelled in the rack maintenance plugin do not have their positions altered as a result of invoking this switch, that would be great.

[mattpascoe]

So here is a fix for you.. However it does not handle already defined racks. I imagine that a SQL update could be written, I just dont currently have time to dig into that. At least the ability is now available. If you're good with it, lets close this issue and maybe open another if need be about an update tool..............

[bpothier]

(Based on the patch from other thread)
Due to how the patch addresses "ascending" numbered racks, the device numbering requires that the top of each device is defined as the location, then the height of the device.
i.e. a 4U device in slot 10 will use slots 10-7, not slots 10-13.
Brian