Reduce Fabrics memory consumption; provisions for UpdateNOC #838

Job	Run time
build_and_test (rustcrypto)	4m 24s
build_and_test (rustcrypto, alloc)	4m 27s
build_and_test (rustcrypto, os)	4m 36s
build_and_test (mbedtls)	4m 38s
build_and_test (mbedtls, alloc)	4m 39s
build_and_test (mbedtls, os)	4m 38s
build_and_test (openssl)	4m 19s
build_and_test (openssl, alloc)	4m 31s
build_and_test (openssl, os)	4m 33s
	40m 45s

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