Reduce Fabrics memory consumption; provisions for UpdateNOC #843

Job	Run time
build_and_test (rustcrypto)	5m 9s
build_and_test (rustcrypto, alloc)	4m 29s
build_and_test (rustcrypto, os)	6m 57s
build_and_test (mbedtls)	4m 49s
build_and_test (mbedtls, alloc)	4m 53s
build_and_test (mbedtls, os)	7m 2s
build_and_test (openssl)	4m 48s
build_and_test (openssl, alloc)	4m 38s
build_and_test (openssl, os)	6m 30s
	49m 15s

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