p2p: Avoid allocating memory for addrKnown where we don't need it

src/bloom.h

@@ -115,9 +115,6 @@ public:
 class CRollingBloomFilter
 {
 public:
-    // A random bloom filter calls GetRand() at creation time.
-    // Don't create global CRollingBloomFilter objects, as they may be
-    // constructed before the randomizer is properly initialized.
     CRollingBloomFilter(const unsigned int nElements, const double nFPRate);
 
     void insert(const std::vector<unsigned char>& vKey);