Fetch collection members in parallel

[nrolans]

I experimented with this idea in https://github.com/nrolans/gofish/commit/85f27a13ac3b528eeef7547593f31158b81c4779

With just two go routines in parallel, the speed up is already noticeable in the firmware inventory.

• Dell R740 with 46 images: 38s to 26s
• Dell R730 with 19 images: 1:58 to 1:13

Is this of interest? If so I can continue this work.

[stmcginnis]

Very cool @nrolans. If you want to propose a PR, that would be great!