T8205 Ensure the vyos_user module works when user properties are defined in… (#445)

• Ensure the vyos_user module works when user properties are defined in aggregate

Ensure the vyos_user module works when user properties are defined in aggregate. Previously the value variable is not filled when a property is configured as a property of a user. This gives a python error when the value variable is called.

• Add unit test for aggregate vyos_user module

• Create vyos_user_aggregate_fix.yml

Create changelog for vyos_user aggregate bugfix

• Rename vyos_user_aggregate_fix.yml to T8205_vyos_user_aggregate_fix.yml

• Rename T8205_vyos_user_aggregate_fix.yml to T8205_vyos_user_aggregate_fix.yml

Remove unintended whitespace in changelog fragment: T8205_vyos_user_aggregate_fix.yml

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Co-authored-by: omnom62 <75066712+omnom62@users.noreply.github.com>
Co-authored-by: Daniil Baturin <daniil@baturin.org>