LHA and likely systemd don't respond to native arrays

[johrstrom]

Most adapters use an array for #native attributes. linux_host and likely systemd use hashes.

So when someone uses an array (like the dashboard's test:jobs rake task does) it throws this runtime error.

rake aborted!
TypeError: no implicit conversion of String into Integer
/users/PZS0714/johrstrom/ondemand/src/apps/dashboard/vendor/bundle/ruby/2.7.0/gems/ood_core-0.20.0/lib/ood_core/job/adapters/linux_host/launcher.rb:97:in `[]'
/users/PZS0714/johrstrom/ondemand/src/apps/dashboard/vendor/bundle/ruby/2.7.0/gems/ood_core-0.20.0/lib/ood_core/job/adapters/linux_host/launcher.rb:97:in `submit_host'
/users/PZS0714/johrstrom/ondemand/src/apps/dashboard/vendor/bundle/ruby/2.7.0/gems/ood_core-0.20.0/lib/ood_core/job/adapters/linux_host/launcher.rb:60:in `start_remote_session'
/users/PZS0714/johrstrom/ondemand/src/apps/dashboard/vendor/bundle/ruby/2.7.0/gems/ood_core-0.20.0/lib/ood_core/job/adapters/linux_host.rb:83:in `submit'These should be casting to hashes as arrays are more popular.

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