More fixes for functional accesses. It now makes the writeback memory leak to crash...

More fixes for functional accesses.  It now makes the writeback memory leak to crash all configs.
Working on that now.

src/mem/cache/base_cache.cc:
    Keep a list of the responders so we can search them on functional accesses.
src/mem/cache/base_cache.hh:
    Properly put things on a list for responses so we can search the list.
    Also, be sure to check the outgoing ports lists on a functional access (factor some common code out there)
src/mem/cache/cache_impl.hh:
    Properly return when the first read hit on a functional access.
    Make sure to call to check the other ports list of packets before forwarding it out.

--HG--
extra : convert_revision : 1d21cb55ff29c15716617efc48441329707c088a