[dtn-security] Implementing Security Destinations in DTN2

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We're working on adding support for defining security source/destinations
in DTN2 (which could be different than the bundle src/dest).

This raised the issue of whether or not we should route the bundle to the
security destination (if defined), rather than the bundle destination. If
we don't route the bundle through the security dest, then it may be
discarded at the bundle dest if it did not pass through the security dest
in transit.

There are also some practical issues that are raised. There can be a
security destination for PIB/PCB, and a (possibly different) security dest
for ESB, and we'd have to decide which one to choose.

Also, the routers in DTN2 access the bundle destination themselves, i.e.
bundle->dest(). They would each have to be corrected to use some other
value.


Any comments/feedback would be appreciated.


thanks,
Angela