Support disjunctive rollout-conditions

[timothysmith0609]

Currently success conditions must ALL be true for a deploy to be considered successful. However, there are cases where different key-value combinations on the watched resource can indicate success/failure.

To accommodate this, let's allow rollout-conditions to be modelled as an array of an array of hash elements (currently it's an array of hash elements).

This keeps backwards compatibility and allows for more expressive conditions

cc @ryanvanhuuksloot

[ivaliotes]

Needs done, but not immediately. Placing in Icebox for attention early in the new year.