Fix release of processors in AjpNioProtocol. Wrong object was used as a key in the connections map.

"connections" is "Map<S,Processor<S>>", so the key in the map is socket, not its wrapper.
Found this in a review inspired by a similar fix in r1426662.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1431171 13f79535-47bb-0310-9956-ffa450edef68