Added wsl linter, and fixed related issues

[enrichman]

This PR adds the wsl linter.

This linter should improve readability enforcing whitespacing and some general rules, like grouping vars in some cases, or newlines before or after some blocks.

i.e:

var nodeStats statsv1alpha1.NodeStats
var allPodsStats []statsv1alpha1.PodStats

var (
	nodeStats    statsv1alpha1.NodeStats
	allPodsStats []statsv1alpha1.PodStats
)