'public' modifier 

Made changes to the function addMethodStubForAbstractMethod. If the
destination type is interface and a method stub is added, then the
method tub should be having th epublic modifier

Change-Id: I0ca1efad07f0e322137067339aea833086239349
Signed-off-by: Kalyan Prasad <ktatavar@in.ibm.com>