fix test reference files to match comments

Andrei Pavel requested to merge 2651-2-3-3-release-changes-2 into master

Closes #2651 (closed). Should fix CtrlAgentGetCfgTest.simple and NetconfGetCfgTest.simple.

get_config_unittest.cc:290
Value of: isEquivalent(unparsed, jsonj)
  Actual: false
Expected: true

https://jenkins.aws.isc.org/job/kea-dev/job/ut-extended/921/#showFailuresLink

Edited by Andrei Pavel

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