director generator does not remove fixed stemcell versions

[cloud-dude]

get-director-template does not remove stemcell versions causing updates to fail.

[alvid-the-bot]

Hi there!

We use Pivotal Tracker to provide visibility into what our team is working on. A story for this issue has been automatically created.

The current status is as follows:

• #135245179 director generator does not remove fixed stemcell versions

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