Revision 931443

https://issues.apache.org/jira/browse/MYFACES-2640
I changed the code to the fragment return in case of the fragment being exactly one root node,
because tests revealed that for extremely complex structures node replacement be fragment subnodes
can be problematic, since the eg recommends anyway to have one root node with the clientId being the id
the change we did still can be left in, but the normal case must be covered in the most stable way and that
is using the fragment instead of its childNodes!