Make env data logging optional

Author: sipa

src/random.cpp

@@ -517,7 +517,7 @@ static void SeedPeriodic(CSHA512& hasher, RNGState& rng) noexcept
     // Dynamic environment data (performance monitoring, ...)
     auto old_size = hasher.Size();
     RandAddDynamicEnv(hasher);
-    LogPrintf("Feeding %i bytes of dynamic environment data into RNG\n", hasher.Size() - old_size);
+    LogPrint(BCLog::RAND, "Feeding %i bytes of dynamic environment data into RNG\n", hasher.Size() - old_size);
 
     // Strengthen for 10 ms
     SeedStrengthen(hasher, rng, 10000);
@@ -537,7 +537,7 @@ static void SeedStartup(CSHA512& hasher, RNGState& rng) noexcept
 
     // Static environment data
     RandAddStaticEnv(hasher);
-    LogPrintf("Feeding %i bytes of environment data into RNG\n", hasher.Size() - old_size);
+    LogPrint(BCLog::RAND, "Feeding %i bytes of environment data into RNG\n", hasher.Size() - old_size);
 
     // Strengthen for 100 ms
     SeedStrengthen(hasher, rng, 100000);