[SGx Mode] Bugs in Teaclave deployment on azure

I built teaclave on azure Standard DC2s v2 VM instance, following the instruction from https://github.com/apache/incubator-teaclave/blob/master/docs/azure-confidential-computing.md

When I tried to launch Teaclave services, I encountered the following error.

```
$ (cd docker && ./run-teaclave-services.sh -d)
/var/run/aesmd/aesm.socket socket detected.
Error: No such volume: aesmd-socket
Cannot find a valid sgx device.
```

I checked properly that SGx driver availability with below results on Azure VM instance.

```
$ ls /dev/sgx
enclave provision
```