Enable count > 1 for AWS ELB by optionally generating random names

[jpadvo]

Name was required for AWS ELB resources, and AWS requires a unique name for each ELB. This made it so that a count greater than 1 would cause repeated names, which blocked the creation of all but the first ELB.

With this commit, if the name is left blank, a random name will be provided so that count greater than 1 can be used for ELBs.

[jpadvo]

I was digging around the issues, and found that the need for this would be obviated by #111. This pull is kind of hacky, and might not actually be worth it.

[pearkes]

Hm, it's an interesting use case. I agree that this should be done higher level, however. We don't have any other random generation of attributes in Terraform and I think that might trip someone up.

Appreciate the changes but going to close in favor of a "first class" solution per #111 as you noted. Thanks!

[jpadvo]

👍