Fix non-string vars in --inventory output

[ctrlok]

I receive a error when I try to use list in output variables:

[all:vars]
panic: interface conversion: interface {} is []interface {}, not string

goroutine 1 [running]:
main.cmdInventory(0x11d35c0, 0xc42000c018, 0x11d35c0, 0xc42000c020, 0xc42000a0e0, 0x0)
	/Users/me/go/src/github.com/adammck/terraform-inventory/cli.go:77 +0x65a
main.main()
	/Users/me/go/src/github.com/adammck/terraform-inventory/main.go:100 +0x4be

[adammck]

Thanks for the patch! Would you mind adding an example to parser_test.go, so we can see how this is supposed to work? I think this tool may originally have been written before Terraform had output types other than string.

[ctrlok]

@adammck I tried to add some tests, but I'm not sure, because I can't check inventory as string, so I add tests from ansible and check equality by counting chars.

[adammck]

I'm sorry, I don't quite understand the need for counting characters. It seems like we should be able to compare expectedInventoryOutput with stdout? What's different about the output?

[ctrlok]

@adammck I do that, because 'expectedInventoryOutput' is unsorted, so I receive different output every time.

[adammck]

Hmm, good point, the output isn't deterministic because we're just iterating the map and dumping it out. How about we sort the keys and iterate that, instead? That'd be more sanely testable, and much better for people who use this tool to dump the inventory and check it into a repo somewhere, too.

[ctrlok]

@adammck Sure. I didn't want to change anything before discuss :)
Also, I find a bug in my code, so I will fix it.

[ctrlok]

@adammck looks like it works :)

[adammck]

Excellent, thanks very much for doing the extra work there. This is a huge improvement.

[adammck]

Isn't this supposed to be grp.Vars[key] ?

[adammck]

Looks like the above error manifests here. These should probably match the vars at :284, in expectedListOutput.

[ctrlok]

Wow. I'm sorry. Will fix it. Sorry again.

[adammck]

It's no problem, I almost missed it myself.

[ctrlok]

@adammck done. Also, I tested it in ansible for sure :) Thanks again!