fix(slugbuilder): check for the succeded status while waiting for slugbuilder pod

[kmala]

Summary of Changes

Since the only reason we need to check if the pod is started or not is to stream the logs, we can add a check to see pod completed status if the pod run has completed before we started checking.

Issue(s) that this PR Closes

Closes #199

Associated End To End Test PR(s)

Associated Documentation PR(s)

Associated Design Document(s)

Testing Instructions

Please provide a detailed list for how to test the changes in this PR.

1. Create a Deis Cluster
2. deploy an app
3. you should be able to successfully deploy and should not be able to reproduce the scenario mentioned in #298

   Pull Request Hygiene TODOs

Please make sure the below checklist is complete.

• [x] Your pull request is concise and to the point (make another PR for refactoring nearby code)
• [x] Your commits are squashed into logical units of work
• [x] Your commits follow the commit style guidelines

[arschles]

@kmala #298 has issues that are directly related, and should be closed if that issue is closed:

• 199

• 185

• 207

Also, would this also solve #57?

[kmala]

This doesn't solve #57 and just fixes #199 . I would be closing the #298 once i am sure all the issues mentioned in it are closed