Add logging more details of failed WebSocket/ETP connection

Type of change

• Bug Fix
• Feature

Does this introduce a change in the core logic?

• [No]

Does this introduce a change in the cloud provider implementation, if so which cloud?

• AWS
• Azure
• GCP
• IBM

Updates description?

• Add logging more details of failed WebSocket/ETP connection (currently there is always "WebSocket connection timed-out")
• Disable internal logging of WebSocketsPP library for client (except Debug level like as in the server code)
• Add warning message about using not suitable WebSocket protocol for current build (accordingly to USE_SSL_CLIENT option)
• Fix name of ETP error code 26: "EIMED_OUT" -> "ETIMED_OUT"

Issue: #47 (closed)