Iter8 Integration

[ukclivecox]

What this PR does / why we need it:

Allow AB and Progressive Rollouts

Which issue(s) this PR fixes:

Fixes #3278

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[review-notebook-app]

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[seldondev]

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[axsaucedo]

/test integration

[axsaucedo]

/test notebooks

[axsaucedo]

/test integration

[axsaucedo]

/test notebooks

[axsaucedo]

Really cool - PR looks good and all e2e tests pass so should be good to merge, only thing is that docs tests are failing

[axsaucedo]

Merging as docs test seems to be failing in master so can fix in separate pr