Move utiltest.cpp from wallet to common

This ensures it is accessible by the test suite when the wallet is
disabled.

src/Makefile.am

@@ -211,6 +211,7 @@ BITCOIN_CORE_H = \
   util.h \
   utilmoneystr.h \
   utilstrencodings.h \
+  utiltest.h \
   utiltime.h \
   validationinterface.h \
   version.h \
@@ -301,8 +302,6 @@ endif
 libbitcoin_wallet_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
 libbitcoin_wallet_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 libbitcoin_wallet_a_SOURCES = \
-  utiltest.cpp \
-  utiltest.h \
   zcbenchmarks.cpp \
   zcbenchmarks.h \
   wallet/asyncrpcoperation_mergetoaddress.cpp \
@@ -384,6 +383,7 @@ libbitcoin_common_a_SOURCES = \
   script/sign.cpp \
   script/standard.cpp \
   transaction_builder.cpp \
+  utiltest.cpp \
   $(BITCOIN_CORE_H) \
   $(LIBZCASH_H)