I/O timeout

From [bblfsh logs](https://github.com/bblfsh/bblfshd/issues/298) we got a message of `rpc error read |0: i/o timeout`. Example of files that triggered this error:

```
sdk/src/Services/KeyManagementService/Generated/_bcl45/IAmazonKeyManagementService.cs
tests/src/JIT/Directed/cmov/Float_Xor_Op.cs
tests/src/JIT/Directed/cmov/Int_And_Op.cs
```