[p2p] add TxDownloadOptions bool to make TxRequestTracker deterministic

Forward this bool to the TxRequestTracker ctor. This is needed for
stablity in TxDownloadManager fuzzers

src/net_processing.cpp

@@ -1889,7 +1889,7 @@ PeerManagerImpl::PeerManagerImpl(CConnman& connman, AddrMan& addrman,
       m_banman(banman),
       m_chainman(chainman),
       m_mempool(pool),
-      m_txdownloadman(node::TxDownloadOptions{pool, m_rng, opts.max_orphan_txs}),
+      m_txdownloadman(node::TxDownloadOptions{pool, m_rng, opts.max_orphan_txs, opts.deterministic_rng}),
       m_warnings{warnings},
       m_opts{opts}
 {

src/node/txdownloadman.h

@@ -43,6 +43,8 @@ struct TxDownloadOptions {
     FastRandomContext& m_rng;
     /** Maximum number of transactions allowed in orphanage. */
     const uint32_t m_max_orphan_txs;
+    /** Instantiate TxRequestTracker as deterministic (used for tests). */
+    bool m_deterministic_txrequest{false};
 };
 struct TxDownloadConnectionInfo {
     /** Whether this peer is preferred for transaction download. */

src/node/txdownloadman_impl.h

@@ -128,7 +128,7 @@ public:
         return *m_lazy_recent_confirmed_transactions;
     }
 
-    TxDownloadManagerImpl(const TxDownloadOptions& options) : m_opts{options} {}
+    TxDownloadManagerImpl(const TxDownloadOptions& options) : m_opts{options}, m_txrequest{options.m_deterministic_txrequest} {}
 
     struct PeerInfo {
         /** Information relevant to scheduling tx requests. */