Remove facilty params/concept from all of tinkerbell

[mmlb]

Facility concept is very EM specific and as such should be removed. I'm pretty sure we don't need it as any current use of it would be better served with explicit URLs instead of plugging facility into a hard code string "template".

[gianarb]

I had quick look at it and this is a bc break I think, the cert endpoint will break because it requires a facility for example.

So, how do we want to proceed? bc break?

@mmlb

[jacobweinstock]

facility has its use but this issue isn't up to date with the code base anymore.