Merge #17699: Make env data logging optional

0ccad08fb2 Make env data logging optional (Pieter Wuille)

Pull request description:

  The dynamic env feeding logging is a bit chatty, make it dependent on `-debug=rand`.

ACKs for top commit:
  practicalswift:
    ACK 0ccad08fb2 -- less noise is good and diff looks correct
  laanwj:
    ACK 0ccad08fb2
  promag:
    ACK 0ccad08fb2.
  jonatack:
    ACK 0ccad08fb2, was considering to propose this.

Tree-SHA512: 01d7f9ac134852c2c0d5f66f96ee4395f0ff7a60573e648f3d01054073624042148c8e8b9f69a29c9a41c296e1f4be77c2015a642ee4113a2fd8779b62aa137d

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);