logging: use util/log.h where possible

Preparation for a future commit where kernel's dependency
on logging.cpp is removed completely.

Replace usage of logging\.h with util/log\.h where it
suffices, and fix wrong includes according to iwyu.

src/kernel/chainparams.cpp

@@ -12,13 +12,13 @@
 #include <crypto/hex_base.h>
 #include <hash.h>
 #include <kernel/messagestartchars.h>
-#include <logging.h>
 #include <primitives/block.h>
 #include <primitives/transaction.h>
 #include <script/interpreter.h>
 #include <script/script.h>
 #include <uint256.h>
 #include <util/chaintype.h>
+#include <util/log.h>
 #include <util/strencodings.h>
 
 #include <algorithm>

src/kernel/coinstats.cpp

@@ -8,7 +8,6 @@
 #include <coins.h>
 #include <crypto/muhash.h>
 #include <hash.h>
-#include <logging.h>
 #include <node/blockstorage.h>
 #include <primitives/transaction.h>
 #include <script/script.h>
@@ -17,6 +16,7 @@
 #include <sync.h>
 #include <uint256.h>
 #include <util/check.h>
+#include <util/log.h>
 #include <util/overflow.h>
 #include <validation.h>
 

src/kernel/context.cpp

@@ -5,8 +5,8 @@
 #include <kernel/context.h>
 
 #include <crypto/sha256.h>
-#include <logging.h>
 #include <random.h>
+#include <util/log.h>
 
 #include <mutex>
 #include <string>