netcmd: models: Rename username to account_name for consistency

netcmd: models: Rename username to account_name for consistency

When creating the User model initially, "username" was the only field that was inconsistently named, it maps to "sAMAccountName".

It should really have been account "account_name".

There is also a field "account_type" and should be similarly named to "account_name".

Basically the naming of fields should always be consistent, breaking the rule for one field only was a mistake.

Signed-off-by: Rob van der Linde <rob@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>