Bump vagrant-hashistack 0.7.1 ~> 0.9.0

[claesgill]

What is the issue?

• Bump vagrant-hashistack 0.7.1 ~> 0.9.0
• Remove unused files (e.g. 00-enable_vault.hcl)

Suggestion(s)/solution(s) [Optional]

Checklist (after created issue)

• [X] Added label(s)
• [X] Added to project
• [X] Added to milestone

[claesgill]

Probably need to bump to version 0.10.x. Ref new release of vagrantbox https://github.com/Skatteetaten/vagrant-hashistack/releases/tag/0.10.1