[c-nsp] "network-admin" account causes "invalid role vdc-operator" in n5k login

[Tassos Chatzithomaoglou]

I have an user with network-admin role configured (the user is 
configured in a tacacs server, his role is either in the tacacs server 
or locally), but i get the following message when he logs in.

%AUTHPRIV-3-SYSTEM_MSG: invalid role vdc-operator downloaded for user 
test - login[10065]

Any idea why the "vdc-operator" role is being tried too? Bug toolkit 
didn't return anything.
The network-admin role is working fine for this user.

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Tassos