Go linting pre commit hook

[bznein]

This PR

WIP PR for adding a pre-commit hook linting step for our Go files.

Together with some fixes to resolve some linting errors.

Notes:

• Before proceeding to the next step we need to decide which of the errors that the linters we actually want to fix and which are ok to be ignored; I'll prepare a list soon
• golancli-lint supports a number of different linters, only some of which are enabled by default. We should check which ones we want and which not. Again I'll come up with a list soon.

All Submissions:

• Have you signed our CLA?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

[LouisPlisso]