add evict call back func in lrucache#43

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juzipeek wants to merge 6 commits intoopenresty:masterfrom

juzipeek:add-destory-func

Commits on Jun 3, 2020

add evict call back func in lrucache
tclxchengjie-zhou
committed

Commits on Jun 8, 2020

add usage; use content_by_lua_block; use pcall wrap call evict func; add call evict_cb at get with ttl item
tclxchengjie-zhou
committed

Commits on Jun 23, 2020

revert toc filed
tclxchengjie-zhou
committed

Commits on Jun 30, 2020

add pcall error check
tclxchengjie-zhou
committed

Commits on Jul 5, 2020