Update logging function

Change-Id: I2726d0a5b391abf7bf1ac55b9aab548ab232978f
diff --git a/core/io_info.go b/core/io_info.go
index c913192..21e1b9a 100644
--- a/core/io_info.go
+++ b/core/io_info.go
@@ -18,8 +18,8 @@
 
 import (
 	"github.com/google/gopacket/pcap"
+	"gerrit.opencord.org/voltha-bbsim/common"
 	"errors"
-	"log"
 )
 
 type Ioinfo struct {
@@ -37,8 +37,8 @@
 			return ioinfo, nil
 		}
 	}
-	err := errors.New("No matched Ioinfo is found !")
-	log.Println(err)
+	err := errors.New("No matched Ioinfo is found")
+	logger.Error("%s", err)
 	return nil, err
 }
 
@@ -48,8 +48,8 @@
 			return ioinfo, nil
 		}
 	}
-	err := errors.New("No matched Ioinfo is found !")
-	log.Println(err)
+	err := errors.New("No matched Ioinfo is found")
+	logger.Error("%s", err)
 	return nil, err
 }
 
@@ -61,8 +61,8 @@
 		}
 	}
 	if len(ioinfos) == 0 {
-		err := errors.New("No matched Ioinfo is found !")
-		log.Println(err)
+		err := errors.New("No matched Ioinfo is found")
+		logger.Error("%s", err)
 		return nil, err
 	}
 	return ioinfos, nil