Refactor how config routes are deleted from outgoing RIB to handle offline routers #1128
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This resolves issue #1126.
Previously the old routes from the configuration were deleted from the peer reactor, leading to the RIB become out of date if the neighbor was offline when an update or sequence of updates was made.
Refactored to this so that any deleted configuration routes are removed from RIB during configuration reload rather than from the reactor.
Tested this with a variety of normal and FlowSpec routes and the RIB is correct all configuration reloads.
I have run all the QA functional tests successfully.