Bug fix for dmtcp.h

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2474 ba6dc0ae-232f-0410-883f-9ebac64fc565
Updated python module to reflect newer dmtcp plugin design.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2475 ba6dc0ae-232f-0410-883f-9ebac64fc565