engine: add sleep to output logs on init (#7931) #8005

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	1h 0m 15s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	18m 48s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	18m 11s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	17m 50s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	18m 5s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	19m 6s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	18m 28s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	18m 58s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	19m 27s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	18m 4s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	52m 59s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	19m 10s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	17m 33s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	18m 17s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	17m 44s
run-macos-unit-tests	0s
Unit tests (matrix)	2s
	5h 52m 57s

Provide feedback