samba-tool: Update 'samba-tool gpo list <>' description

We have a command to get gpo listing from Active Directory. samba-tool gpo list

This command can list GPOs for both username and machinename, But command help only shows 'username'.

This PR

  • Updates the option presented in help.
  • Updates name of variable used to retrieve GPO so that it's not misleading if someone reads code later on


Signed-off-by: Amit Kumar

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