027e8224e4
Motivation: When a channel was registered before and is re-registered we need to respect ChannelConfig.isAutoRead() and so start reading one the registration task completes. This was done "by luck" before 15162202fb82e2293624a86bfc27a9c5c35960be. Modifications: Explicit start reading once a Channel was re-registered if isAutoRead() is true. Result: Correctly receive data after re-registration completes.