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new_route() and del_route() were not safely handling the lock of the RIB.
Replace lpm_lookup_ipv4() and lpm_lookup_ipv6() with rib_lookup(). lpm_lookup_ipv4() and lpm_lookup_ipv6() are now only used to look up destination addresses in packets. This prepares the code to eventually support SmartNICs that can offload LPM lookups.
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The code around the FIB has tried to do some of the work related to adding and removing entries without holding a lock. The intention was to be faster, but the savings are small since there are way more readers than writers. Moreover, the risk of crashing Gatekeeper is too high. This pull request conservatively protects this code by acquiring the lock before it.
In addition, all FIB lookups that are not for incoming packets are rewritten to use the Routing Information Base added in pull request #594. This prepares Gatekeeper to eventually support NICs that can offload LPM lookups.