Rollout functionality checks resources in series

[tonglil]

See https://github.com/NYTimes/drone-gke/pull/58/files/e7eae61cf7b7a157c9c951502309d327083fb7ff#r156678397.

Need to confirm if checking for rollout of multiple resources can be performed in series, or are affected by time.

• what happens when checking rollout of a resource that is already completed?
• what if there are multiple rollouts of the same resource going on (for example, the next build started a rollout before the current build ran kubectl rollout)?

[chuhlomin]

what happens when checking rollout of a resource that is already completed?

Command will return deployment "bodega-server" successfully rolled out right away.