Fix for OPENAM-2102 - review: CR-1186
Implementing support for unsolicited LDAP responses, so a notice of
disconnection can be properly handled.

git-svn-id: https://svn.forgerock.org/openam/trunk/openam@4103 0f4defcf-c51a-4c67-9f44-6fb5eba73c5d