Score all 2017 Q4 Gitaly OKRs and retrospect

Please score all Gitaly 2017 Q4 OKRs and retrospect:

• https://about.gitlab.com/okrs/2017-q4/

New scoring/retro process:

• https://about.gitlab.com/okrs/#scoring

Retro example:

• https://about.gitlab.com/okrs/2017-q4/#retrospective

Assign MR to me to discuss and merge.

Thanks!