THRIFT-2785 Wrap errors in iostream_transport.go
Client: Go
Patch: GitHub user cvlchinet <cvl@chinet.info>

This closes #246

Wrap errors in iostream_transport.go using NewTTransportExceptionFromError

When I used the StreamTransport to do unit tests I noticed that the EOF TTransportException is not correctly thrown. I quickly found out that the errors in iostream_transport.go where not wrapped with NewTTransportExceptionFromError.