Goroutines leak in notify listener

[zeslava]

Here is sending message for notify listeners: https://github.com/arangodb/go-driver/blob/master/vst/protocol/message.go#L58

Here are 2 reads from this channel:

1. https://github.com/arangodb/go-driver/blob/master/vst/connection.go#L169
2. https://github.com/arangodb/go-driver/blob/master/vst/authentication.go#L143

If readers doesn't read from channel, then write is locked and goroutine leak. In 1st case it's possible when context.Done() In 2nd case - when conn.Send returns error

Possible solutions:

• Write to channel with context + select(such as read in 1st)
• When context is done while read, then continue read channel in goroutine then just log or smth