Remove log filtering and add stringsetflag.

common/logging/gologger/logger.go

Index: common/logging/gologger/logger.go
diff --git a/common/logging/gologger/logger.go b/common/logging/gologger/logger.go
index 8c5f1ef78ddff98b0ca74ca7ce97f933195cf6fe..53c6adcc2b67912b986cf682f5a2b4067f0ccd2f 100644
--- a/common/logging/gologger/logger.go
+++ b/common/logging/gologger/logger.go
@@ -81,7 +81,7 @@ func (li *loggerImpl) LogCall(l logging.Level, calldepth int, format string, arg
 // '%' characters in the fields string are escaped so they can't be interpreted
 // as format characters when appended to the initial format string.
 func formatWithFields(format string, fields logging.Fields, args []interface{}) string {
-	fieldString := strings.Replace(fields.FieldString(true), "%", "%%", -1)
+	fieldString := strings.Replace(fields.String(), "%", "%%", -1)
 
 	buf := bytes.Buffer{}
 	buf.Grow(len(format) + logMessageFieldPadding + len(fieldString))