Fixes #20921 - use String.chomp instead of slicing to remove newlines

[evgeni]

No description provided.

[theforeman-bot]

Issues: #20921

[theforeman-bot]

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• length of the first commit message line for 92fba96 exceeds 65 characters

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[johnpmitsch]

irb(main):005:0> `hammer -u admin -p changeme$ capsule list | grep "changed34" | awk '{ print $1 }'`.chomp
=> "1"

Much better way of doing things, thanks! :)

[johnpmitsch]

@evgeni just needs a rebase from the hammer_cmd PR

[evgeni]

rebased