introduced an abstract base Session class to allow tests to define and use a mock session class.
completed one notify test case using a mock session. it identified a bug in the main code so the test fails right now. git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac221@2327 e5f2f494-b856-4b98-b285-d166d9295462
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