Cleanup code path when adding a new user

1) Only attempt to delete the oldusername if it actually was non-empty - at the moment errors are logged in the system log when adding a new user, because the code was trying to delete the user name "".
2) Call local_user_set() first to create (change, whatever) the user record. This makes the user record exist for a new user. Then call local_user_set_groups() to sort out what groups the user should be in or not in. The existing code would fail to add a new user to the specified group/s because local_user_set_groups() was called too early, before the user actually existed.

Typical system log errors from the old code:
Mar 18 17:10:31 	php-fpm[9542]: /system_usermanager.php: Tried to remove user but got user pw instead. Bailing.
Mar 18 17:10:31 	php-fpm[9542]: /system_usermanager.php: The command '/usr/sbin/pw groupmod admins -g 1999 -M '0,2003,2006,2008' 2>&1' returned exit code '67', the output was 'pw: user `2008' does not exist'

From looking at the code history, I think this has been this way for a long time, not a new bug at all.

Discussed in forum: https://forum.pfsense.org/index.php?topic=90700.msg501766#msg501766

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