[j-nsp] erase configuration

[sthaug at nethelp.no]

> What i did some time, is enter to the configuration and execute delete.

Except that if you delete at the top level, JunOS won't let you commit
the configuration due to lack of root password. I always found this
inconsistent/irritating, when I really *do* want to reset to an empty
configuration.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no