Motivation:

In JDK9 the Cleaner.clean method cannot be called as it is not exported
from `java.base`. `Runnable.run` should be called instead.

Modifications:
Pick Runnable.run if the cleaner implements Runnable. Otherwise try the
clean method on the class implementing the cleaner.

Result:
The cleaner for direct byte buffers is run on JDK9 as well as earlier
JDKs.

…E header (#1)

VISA-11: Backported the PR netty#9585

Add fix for http request smuggling, cause by obfuscating TE header.