Introduce dutagent config validation

[sylv-io]

Add configuration validation to detect device names that conflict with dutagent subcommands.

Addresses #84

[sylv-io]

fyi: Lint error is unrelated to my code. i did not modify cmds/exp/dutserver/rpc.go.

[sylv-io]

Do not Merge. we should do the validation using custom UnmarshalYAML instead. (analog to the device and command validation)

[jenstopp]

And we should keep the lists of reserved words as exported var/const in a respective place/package so that is shows up at go doc.

[sylv-io]

I moved the validation into the UnmarshalYAML method 👍

And we should keep the lists of reserved words as exported var/const in a respective place/package so that is shows up at go doc.

I tried, but i cannot define []string as const and also the Linter argues because global vars are not allowed. Not sure how to fullfill this request 😅. Any recommendation?

[RiSKeD]

i think you can add a local var string[] to the pkg and expose it via a function. I am not sure what else can be done expect disable the linter on that line.