Reduce log spam

New debug category "staking" added with some previous `LogPrintf`
messages recategorized to reduce log spam.

Also noted both "staking" and "precompute" in the init help message and
added them to the "pivx" umbrella category.

src/init.cpp

@@ -500,7 +500,7 @@ std::string HelpMessage(HelpMessageMode mode)
         strUsage += HelpMessageOpt("-stopafterblockimport", strprintf(_("Stop running after importing blocks from disk (default: %u)"), 0));
         strUsage += HelpMessageOpt("-sporkkey=<privkey>", _("Enable spork administration functionality with the appropriate private key."));
     }
-    string debugCategories = "addrman, alert, bench, coindb, db, lock, rand, rpc, selectcoins, tor, mempool, net, proxy, http, libevent, pivx, (obfuscation, swiftx, masternode, mnpayments, mnbudget, zero)"; // Don't translate these and qt below
+    string debugCategories = "addrman, alert, bench, coindb, db, lock, rand, rpc, selectcoins, tor, mempool, net, proxy, http, libevent, pivx, (obfuscation, swiftx, masternode, mnpayments, mnbudget, zero, precompute, staking)"; // Don't translate these and qt below
     if (mode == HMM_BITCOIN_QT)
         debugCategories += ", qt";
     strUsage += HelpMessageOpt("-debug=<category>", strprintf(_("Output debugging information (default: %u, supplying <category> is optional)"), 0) + ". " +

src/miner.cpp

@@ -165,7 +165,7 @@ CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn, CWallet* pwallet,
         }
 
         if (!fStakeFound) {
-            LogPrintf("CreateNewBlock(): stake not found\n");
+            LogPrint("staking", "CreateNewBlock(): stake not found\n");
             return NULL;
         }
     }

src/util.cpp

@@ -244,6 +244,8 @@ bool LogAcceptCategory(const char* category)
                 ptrCategory->insert(string("mnpayments"));
                 ptrCategory->insert(string("zero"));
                 ptrCategory->insert(string("mnbudget"));
+                ptrCategory->insert(string("precompute"));
+                ptrCategory->insert(string("staking"));
             }
         }
         const set<string>& setCategories = *ptrCategory.get();

src/wallet.cpp

@@ -3001,7 +3001,7 @@ bool CWallet::CreateCoinStake(
     }
 
     if (listInputs.empty()) {
-        LogPrintf("CreateCoinStake(): listInputs empty\n");
+        LogPrint("staking", "CreateCoinStake(): listInputs empty\n");
         MilliSleep(50000);
         return false;
     }
@@ -3106,7 +3106,7 @@ bool CWallet::CreateCoinStake(
         if (fKernelFound)
             break; // if kernel is found stop searching
     }
-    LogPrintf("%s: attempted staking %d times\n", __func__, nAttempts);
+    LogPrint("staking", "%s: attempted staking %d times\n", __func__, nAttempts);
 
     if (!fKernelFound)
         return false;