Use fixPacket function everywhere.

Fix fixPacket assert function.
Stop timing port from forwarding the request if a response was found in its queue on a read.

src/cpu/memtest/memtest.cc:
src/cpu/memtest/memtest.hh:
src/python/m5/objects/MemTest.py:
    Add parameter to configure what percentage of mem accesses are functional
src/mem/cache/base_cache.cc:
src/mem/cache/cache_impl.hh:
    Use fix Packet function
src/mem/packet.cc:
    Fix an assert that was checking the wrong thing
src/mem/tport.cc:
    Properly detect if we need to do the access to the functional device

--HG--
extra : convert_revision : 447cc1a9a65ddd2a41e937fb09dc0e7c74e9c75e

src/python/m5/objects/MemTest.py

@@ -13,6 +13,7 @@ class MemTest(SimObject):
     percent_reads = Param.Percent(65, "target read percentage")
     percent_source_unaligned = Param.Percent(50,
         "percent of copy source address that are unaligned")
+    percent_functional = Param.Percent(50, "percent of access that are functional")
     percent_uncacheable = Param.Percent(10,
         "target uncacheable percentage")
     progress_interval = Param.Counter(1000000,