postgres admin.sql fixes

[Alan DeKok]

John Dennis wrote:
> While we're in the process of fix SQL schema, as per an email a few
> days, it seems like MySQL no longer wants a length qualifier on the
> TIMESTAMP data type. There are a couple of places in
> /etc/raddb/sql/mysql which specify "timestamp(14)", according to the
> MySQL docs it should just be "timestamp". I haven't tested the change,
> just going from the docs and the reported error.

  Fixed, thanks.

  Alan DeKok.