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[t:4874], make toku_brtheader_remove_txn_ref still depend on the ydb lock. Holding the header lock while trying to close leads to deadlocks. Need to rethink how to get close during toku_brtheader_remove_txn_ref working

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[t:4875], reorder some functions in brt_header.c to put logically connected functions next to each other

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[t:4875], memset header to 0 when creating it, get rid of calls to toku_read_brt_header_and_store_in_cachefile in brt-test-helpers

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need to fix it


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[t:4814] remove --run-libc-freeres=no because I fixed how things were getting linked, apparently, and don't need that anymore (it was generating false valgrind failures)

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Deleted duplicate function, added some optimizations to make 'no lock conflict' faster
since it's the common case.

Cleaned up the way lock tree row lock conflicts are tested (only for the new test and one existing one)


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