always try xfrout connection regardless of the availability of boost.python.
without boost.python we'll simply reject xfr requests upon receiving exception. this exception-based approach is not efficient, but should be okay because this is a shortterm workaround. git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac221@2319 e5f2f494-b856-4b98-b285-d166d9295462
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