CC enclave app example: check that handshake is successful. #727

Job	Run time
build_attest_all (buildconfigs/key_xor_test_app.sh)	17m 0s
build_attest_all (buildconfigs/oak_client_android_app.sh)	52m 33s
build_attest_all (buildconfigs/oak_containers_agent.sh)	12m 38s
build_attest_all (buildconfigs/oak_containers_kernel.sh)	32m 33s
build_attest_all (buildconfigs/oak_containers_orchestrator.sh)	27m 17s
build_attest_all (buildconfigs/oak_containers_stage1.sh)	23m 41s
build_attest_all (buildconfigs/oak_containers_syslogd.sh)	25m 8s
build_attest_all (buildconfigs/oak_containers_system_image.sh)	25m 35s
build_attest_all (buildconfigs/oak_containers_nvidia_system_image.sh)	26m 30s
build_attest_all (buildconfigs/oak_echo_enclave_app.sh)	17m 24s
build_attest_all (buildconfigs/oak_echo_raw_enclave_app.sh)	19m 2s
build_attest_all (buildconfigs/oak_functions_enclave_app.sh)	18m 47s
build_attest_all (buildconfigs/oak_functions_insecure_enclave_app.sh)	18m 57s
build_attest_all (buildconfigs/oak_orchestrator.sh)	18m 45s
build_attest_all (buildconfigs/oak_restricted_kernel_simple_io_init_rd_wrapper_bin.sh)	44m 20s
build_attest_all (buildconfigs/stage0_bin.sh)	43m 19s
build_attest_all (buildconfigs/stage0_bin_tdx.sh)	42m 32s
	7h 46m 1s

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