policy/v2: separate exit node and 0.0.0.0/0 routes

[kradalby]

Fixes #2568

[ghost]

Pull Request Revisions

Revision	Description
r1	Route approval policy logic updated Modified route approval mechanism in policy manager to handle exit routes and auto-approvers more precisely, with updated logic for resolving and checking route approvals

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[ghost]

In hscontrol/policy/v2/policy.go, the exitSetHash is computed using deephash.Hash(&autoMap) rather than using the exitSet. Was this intentional or should it be deephash.Hash(exitSet) instead?