Re: [apache/incubator-teaclave] Got error when invoking echo function by python! (#411)

[Agzs <no...@github.com>]

And I use teaclave_sgx_tool and obtain its report as follows:
```
ethtest@ethtest:incubator-teaclave$ find ./ -name teaclave_sgx_tool
./build/target/untrusted/debug/teaclave_sgx_tool
./release/tool/teaclave_sgx_tool
*****************************************************************************************************************************************
ethtest@ethtest:incubator-teaclave$ ./build/target/untrusted/debug/teaclave_sgx_tool status
Vendor: GenuineIntel
CPU Model: Intel(R) Core(TM) i7-9700 CPU @ 3.00GHz
SGX: 
  Has SGX: true
  Has SGX1: true
  Has SGX2: false
  Supports ENCLV instruction leaves EINCVIRTCHILD, EDECVIRTCHILD, and ESETCONTEXT: false
  Supports ENCLS instruction leaves ETRACKC, ERDINFO, ELDBC, and ELDUC: false
  Bit vector of supported extended SGX features: 0x00000000
  Maximum supported enclave size in non-64-bit mode: 2^31
  Maximum supported enclave size in 64-bit mode: 2^36
  Bits of SECS.ATTRIBUTES[127:0] set with ECREATE: 0x0000000000000036 (lower) 0x000000000000001F (upper)
  EPC physical base: 0x0000000080200000
  EPC size: 0x0000000005D80000 (93M)
  Supports flexible launch control: true
  SGX device: /dev/sgx false, /dev/isgx true
  AESM service: true

Kernel module (isgx):
filename:       /lib/modules/5.4.0-42-generic/kernel/drivers/intel/sgx/isgx.ko
license:        Dual BSD/GPL
version:        2.6.0
author:         Jarkko Sakkinen <ja...@linux.intel.com>
description:    Intel SGX Driver
srcversion:     F725A4ECA4194E2D2470F56
alias:          acpi*:INT0E0C:*
depends:        
retpoline:      Y
name:           isgx
vermagic:       5.4.0-42-generic SMP mod_unload 

Kernel module (sgx):
modinfo: ERROR: Module sgx not found.

Kernel module (intel_sgx):
modinfo: ERROR: Module intel_sgx not found.
```
But, when I test attestation, it reports errors as follows:
```
ethtest@ethtest:incubator-teaclave$ ./build/target/untrusted/debug/teaclave_sgx_tool attestation --key XXX --spid XXX 
Error: found SGX error: SGX_ERROR_ENCLAVE_FILE_ACCESS
****************************************************************************************************************************************
ethtest@ethtest:incubator-teaclave$ ./release/tool/teaclave_sgx_tool attestation --key XXX --spid XXX --url https://api.trustedservices.intel.com:443 --algorithm sgx_epid
Error: found SGX error: SGX_ERROR_ENCLAVE_FILE_ACCESS
```

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