Changing the Bloom filter hashing so that it's independent of

CompositeHash.

We do this by hashing values added to a BloomFilter another time more
with a stable hash seeded only by either the filter's name or the
global_hash_seed (or Bro's random() seed if neither is defined).

I'm also adding a new bif bloomfilter_internal_state() that returns a
string representation of a Bloom filter's current internal state. This
is solely for writing tests that check that the filters end up
consistent when seeded with the same value.

src/probabilistic/CounterVector.cc

@@ -153,6 +153,11 @@ CounterVector operator|(const CounterVector& x, const CounterVector& y)
 
 }
 
+size_t CounterVector::Hash() const
+	{
+	return bits->Hash();
+	}
+
 bool CounterVector::Serialize(SerialInfo* info) const
 	{
 	return SerialObj::Serialize(info);