network: Add another collision check into networkCheckRouteCollision
network: Add another collision check into networkCheckRouteCollision

The comment above that function says: "This function can be a lot more
exhaustive, ...", so let's be.

Check for collisions between routes in the system and static routes
being added explicitly from the <route/> element of the network XML.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1094205

Signed-off-by: Martin Kletzander <e82f23e74d43760279ebcc505dac4ae70d5627d0@redhat.com>

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