Add sessionDown notification in EtchStubBase

In case an exception occurs during the execution of an execution
helper, the session down event gets send to the user.

Change-Id: I74e91fecf664f129c2edd4767175f0e9d975f4d6

git-svn-id: https://svn.apache.org/repos/asf/etch/trunk@1679587 13f79535-47bb-0310-9956-ffa450edef68
1 file changed