Packer fills /tmp, does not clean up after itself

[austinhyde]

According to @ichilton in issue #2, packer fills up /tmp, and although supposedly it obeys the TMPDIR environment variable to change where it builds, supplying this through Ansible doesn't appear to transfer through to packer.

1. Figure out why setting TMPDIR doesn't affect packer behavior
2. Either make the Ansible-set environment variable pass through, or provide a way to force it through via a module argument.
3. Figure out if there's a good reason packer isn't cleaning up after itself.
4. Make the module clean up after itself. Might want to make this optional.

[austinhyde]

1/2 - maybe need to add a -E to the sudo from PR #3?

[sanderboom]

Ah, sorry for posting the related issue separately in #7. Not entirely similar though.