Fix change detection for recent Vyos versions

[isundaylee]

Change Summary

Recent Vyos versions started returning this for no-change compare saved output:

No changes between working and saved configurations.

[edit]

instead of just [edit]. This causes vyos_config to always return a changed result. This PR fixes the issue by properly detecting both cases.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Other (please describe):

Related Task(s)

N/A

Related PR(s)

N/A

Proposed changes

See "Change Summary" section.

How to test

Point my Ansible code to use a version of vyos.vyos with this patch in requirements.txt, run ansible-galaxy install -r requirements.yml --force, and verify that vyos_config now properly returns ok instead of changed when there are no changes.

- name: [email protected]:isundaylee/vyos.vyos.git
  type: git
  version: bug/vyos_config_changed

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

[isundaylee]

@c-po @sever-sever Thanks for the reviews! Just want to check - is there anything else I need to do before this gets merged? No rush at all - just checking. Thanks!