Add option to do init run-all for terragrunt #799

Job	Run time
test-directory-failure	8s
terraform-plan (changes, false)	11s
terraform-plan (no-changes, false)	16s
terraform-plan (format-error, true)	10s
terraform-plan (invalid, true)	16s
terraform-plan (conftest-deny, true)	23s
terraform-plan (skip-conftest, false, true)	10s
terraform-plan (skip-fmt, false, true)	15s
terraform-plan (skip-plan, false, true)	15s
terraform-plan (truncate-plan, false)	29s
terraform-plan (init-fail, true)	9s
terraform-plan (validate-fail, true)	10s
terraform-plan (import, true)	29s
terraform-plan (terragrunt, false, true)	19s
terraform-plan (init-run-all, false, true, true)	27s
test-action-comments	2s
	4m 9s

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