Resolve force_flag: unbound variable error

[genevieve]

When deleting all bosh deployments, we reference the force_flag but it is not set in that function.

What is this change about?

Describe the change and why it's needed.

Please provide contextual information.

Include any links to other PRs, stories, slack discussions, etc... that will help establish context.

Please check all that apply for this PR:

• [ ] introduces a new task
• [x] changes an existing task
• [ ] changes the Dockerfile
• [ ] introduces a breaking change (other users will need to make manual changes when this is released)

Did you update the README as appropriate for this change?

• [ ] YES
• [ ] N/A

How should this change be described in release notes?

Something brief that conveys the change and is written with the component author audience in mind.

What is the level of urgency for publishing this change?

• [ ] Urgent - unblocks current or future work
• [ ] Slightly Less than Urgent

Tag your pair, your PM, and/or team!

It's helpful to tag a few other folks on your team or your team alias in case we need to follow up later.

[cfdreddbot]

:white_check_mark: Hey genevieve! The commit authors and yourself have already signed the CLA.

[cf-gitbot]

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

https://www.pivotaltracker.com/story/show/167653609

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

[davewalter]

Thanks @genevieve!