Do not allocate memory for system in kind

[csantanapr]

Fixes #197

[nabuskey]

I actually don't know why these were in place. We can certainly reserve memory for system resources but 4G does seem too much. @greghaynes Any consequences for reducing these?

[csantanapr]

Can we get an update on this PR?
Some users can benefit of been able to run idpbuilder in systems with lower memory than 12GB of RAM

[greghaynes]

I dont think this was intentional - I'm pretty sure this came in when we copied an example configuration.

[greghaynes]

@csantanapr did you intentionally close this? Removing this memory requirement seems reasonable to me.

[nimakaviani]

re-opening. i think closing this was accidental.