out_loki: add new option 'uri' to customize HTTP URI endpoint #8142

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	19m 27s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	18m 53s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	18m 12s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	17m 59s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	18m 22s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	18m 53s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	19m 37s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	19m 12s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	19m 39s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	18m 13s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	53m 9s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	18m 37s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	18m 31s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	19m 8s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	18m 37s
run-macos-unit-tests (-DFLB_JEMALLOC=Off)	11m 0s
run-macos-unit-tests (-DFLB_SANITIZE_MEMORY=On)	18m 26s
run-macos-unit-tests (-DFLB_SANITIZE_THREAD=On)	12m 47s
Unit tests (matrix)	1s
	5h 58m 43s

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