WIP: Add retry logic to windows post-start script

[krutten]

Retry logic to give #64 longer to successfully start up.

#173903627

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/173994068

The labels on this github issue will be updated when the story is started.

[krutten]

Paired with Hanlin Shi (hanlins) to validate new retry logic

[hanlins]

This should fix https://github.com/cloudfoundry/bosh-dns-release/issues/64.