Make debugLog() return a beast::Journal (RIPD-1209):

Previously, writes using debugLog() tagged every entry with
"TRC:".  Now users of debugLog() must specify the severity
level they want their information logged at.

src/ripple/protocol/impl/STInteger.cpp

@@ -52,7 +52,7 @@ STUInt8::getText () const
         if (transResultInfo (static_cast<TER> (value_), token, human))
             return human;
 
-        JLOG (debugLog())
+        JLOG (debugLog().error())
             << "Unknown result code in metadata: " << value_;
     }
 
@@ -70,7 +70,7 @@ STUInt8::getJson (int) const
         if (transResultInfo (static_cast<TER> (value_), token, human))
             return token;
 
-        JLOG (debugLog())
+        JLOG (debugLog().error())
             << "Unknown result code in metadata: " << value_;
     }