fixes: lots of fixes for file descriptor leaks. #8597

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	13m 49s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	13m 37s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	12m 48s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	11m 54s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	11m 51s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	13m 29s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	13m 12s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	11m 57s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	11m 59s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	12m 0s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	43m 42s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	11m 41s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	11m 45s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	11m 37s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	11m 38s
run-macos-unit-tests	0s
Unit tests (matrix)	1s
	3h 37m 0s

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