Option to replace initial mDNS and DevAtt post-construction #697

Job	Run time
build_and_test (rustcrypto)	3m 36s
build_and_test (rustcrypto, alloc)	3m 49s
build_and_test (rustcrypto, os)	5m 18s
build_and_test (mbedtls)	3m 49s
build_and_test (mbedtls, alloc)	4m 1s
build_and_test (mbedtls, os)	5m 51s
build_and_test (openssl)	3m 42s
build_and_test (openssl, alloc)	3m 42s
build_and_test (openssl, os)	4m 58s
	38m 46s

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