Simon Willnauer 8a0393f718 Move assertion for open channels under TcpTransport lock
TcpTransport has an actual mechanism to stop resources in subclasses.
Instead of overriding `doStop` subclasses should override `stopInternal`
that is executed under the connection lock guaranteeing that there is no
concurrency etc.

Relates to #22554
2017-01-11 23:37:12 +01:00
..