nft-cache: Introduce cache levels

Replace the simple have_cache boolean by a cache level indicator
defining how complete the cache is. Since have_cache indicated full
cache (including rules), make code depending on it check for cache level
NFT_CL_RULES.

Core cache fetching routine __nft_build_cache() accepts a new level via
parameter and raises cache completeness to that level.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>

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