Regenerated policies don't match policies used for PLDI

[Aaron Gember-Jacobson]

For many networks every traffic class switches from always reachable (policies used for PLDI) to always blocked (regenerated policies).

[Aaron Gember-Jacobson]

Commit 3445858 stopped the installation of edges that allow source and destination on same device to be reachable. Issue resolved by 1be2b38 by adding edges that go directly from source to destination vertex, without passing through any process vertices.

Still need to make changes to repair code to account for edges directly between source and destination.

[Aaron Gember-Jacobson]

Modified the repair code to account for edges directly between source and destination.