[c-nsp] TACACS+ & console port auto-anable mode

[Scott Altman]

I don't recall which part of these config lines makes it all go, but
the combination does...  :-)

Should drop you into enable after passing auth.

IOS configuration:
aaa new-model
aaa authentication login default group tacacs+ line
aaa authentication login console group tacacs+ line
aaa authorization console
aaa authorization config-commands
aaa authorization exec default group tacacs+ if-authenticated
aaa authorization commands 15 default group tacacs+ if-authenticated