Add Terraform 0.15, remove 0.13, update 0.14 and add retry to packet PR #7927
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What type of PR is this?
/kind feature
What this PR does / why we need it:
Update Terraform CI tests (remove 0.13, add 0.15)
Add retry for packet jobs
Which issue(s) this PR fixes:
none
Special notes for your reviewer:
none
Does this PR introduce a user-facing change?: