HTTPASYNC-81: request producer and response producer #failed methods never get called in case of a connection request failure (for instance due to unknown or invalid hostname)

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpasyncclient/branches/4.0.x@1616123 13f79535-47bb-0310-9956-ffa450edef68
HTTPASYNC-81: Premature response consumer termination

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpasyncclient/branches/4.0.x@1616124 13f79535-47bb-0310-9956-ffa450edef68