command: Ask for user variables before validation.

[tpounds]

Fixes an issue where user variables are not prompted for prior to validation. It is an almost identical fix to issue #736 (commit fb3f10e) but for the plan and refresh commands.

Error without fix.

$ terraform refresh
There are warnings and/or errors related to your configuration. Please fix these before continuing.

Errors:

  * 1 error(s) occurred:

* Required variable not set: foo

[jen20]

@tpounds Sorry, this PR predates me being a core committer on Terraform and apparently my searches didn't find it. It turns out that all of these fixes have been made via different pull requests between August and now and will be in the next point release. Thanks for the contribution - the tests are appreciated also!

[tpounds]

No problem thanks for the update!

[ghost]

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