feat: add additional configuration options

[DavidRobson]

Summary of Pull Request

Adds support for setting additional packer configuration options (resource_pool, set_host_for_datastore_uploads and ip_settle_timeout).

I came across issues on one of our vSphere environments and had to set additional parameters. I have seen various discussions where other users mentioned setting the same parameters on certain configurations so I think it would be useful to include these as options in this project that users can set if they would like.

I set default values for these so any existing deployments people have should not break as it should use the defaults and behave as before.

Type of Pull Request

• This is a bugfix. type/bug
• This is an enhancement or feature. type/feature or type/enhancement
• This is a documentation update. type/docs
• This is a refactoring update. type/refactor
• This is a chore. type/chore
• This is something else.
  Please describe:

Related to Existing Issues

Closes #772

Test and Documentation Coverage

• Tests have been completed.
• Documentation has been added or updated.

Breaking Changes?

• Yes, there are breaking changes.
• No, there are no breaking changes.

[vmwclabot]

@DavidRobson, you must sign our contributor license agreement before your changes are merged. Click here to sign the agreement. If you are a VMware employee, read this for further instruction.

[tenthirtyam]

Hi @DavidRobson! 👋

Thank you for the contribution!

Please sign the VMware CLA and an enhancement issue per the contributing guidelines. Then link the pull request to the issue.

Thank you!

Ryan

[tenthirtyam]

Marked as draft until CLA is signed and enhancement issue is created.

[vmwclabot]

@DavidRobson, we have received your signed contributor license agreement. The review is usually completed within a week, but may take longer under certain circumstances. Another comment will be added to the pull request to notify you when the merge can proceed.

[DavidRobson]

@tenthirtyam raised a new issue and linked it, and signed the CLA. I guess we just need to wait for the CLA to be reviewed now.

[tenthirtyam]

Thank you! Will merge once the CLA is approved by our OS team.

[vmwclabot]

@DavidRobson, VMware has approved your signed contributor license agreement.

[tenthirtyam]

I'll get this merged today.

[tenthirtyam]

LGTM! 🚀

[github-actions]

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