Refactor out the Globals global from util/util.go

[vishal4071]

Global variables make it harder to track where and how a variable is being modified.
Refactoring becomes difficult as dependencies are scattered across the code.
Since global variables can be accessed and modified from anywhere, changes in one part of the code can unintentionally affect another part.

Removed global from util/util.go

Fixes: BUG1064013

[manith-arista]

We might need to have a syncup with Maciej again, this change might conflict with
#152

[mkisielewski-arista]

We might need to have a syncup with Maciej again, this change might conflict with #152

Indeed, some of the changes here are covered by #152

This PR here has one big commit, but maybe @vishal4071 has this split into separate commits, so it's easier to apply it partially?