This is the work for the server-side only, the client side will be done in another pull request.

Previously, AbstractConnection.getInvocationType() was called by AbstractConnection.ReadCallback, but it was deprecated and is now removed, along with all its overrides.

This mechanism is now replaced by using a specific Callback implementation for each AbstractConnection subclass.
For example, HttpConnection uses HttpConnection.FillableCallback that in turn asks the InvocationType to the Server, and therefore the `Handler` tree.

Restored synchronous code for ServerFCGIConnection.close(), ensuring super.close() is always called.
Ensuring that in HttpConnection.close(), super.close() is always called.

Signed-off-by: Simone Bordet <[email protected]>

Signed-off-by: Simone Bordet <[email protected]>

Improved messages
used on more modules

…cationtype-cleanups'.

Signed-off-by: Simone Bordet <[email protected]>

…for idle timeout and failure tasks.

* Small code improvements.

Signed-off-by: Simone Bordet <[email protected]>

… error response) and the promise (resetting the stream).

Signed-off-by: Simone Bordet <[email protected]>

Signed-off-by: Simone Bordet <[email protected]>

Signed-off-by: Simone Bordet <[email protected]>

Signed-off-by: Simone Bordet <[email protected]>

…cationtype-cleanups'.

Signed-off-by: Simone Bordet <[email protected]>

Signed-off-by: Simone Bordet <[email protected]>