[message] add API functions to enable multicast looping of a message #27

Job	Run time
expects	29m 7s
packet-verification-1-1-on-1-3	9m 54s
packet-verification-low-power	4m 28s
thread-1-3-gcc-m32	9m 52s
thread-1-3-posix	8m 1s
thread-1-3-gcc-m64	9m 49s
thread-1-3-clang-10-m32	9m 59s
thread-1-3-clang-10-m64	55s
upload-coverage	0s
delete-coverage-artifacts	0s
	1h 22m 5s

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