[c-nsp] ME3600X 15.2S memory leak

[Nick Hilliard]

James Bensley wrote:
> That is old dodgy code. You should be on the 15.3(3)S range in my
> opinion, In particular from about 15.3(3)S3 things got nice and
> stable, and each version from then onwards we have been moving onto.
> We are using 15.3(3)S6 now without issue.

l3vpn started working properly on 15.3(3)S2 or so.  Was horribly broken
before then.  S4 or later are pretty good.

Nick