Streamline Logging to be more useful for using the proto-kms

This aims at addressing issue #3 (closed)

Problem Description

Right now logging is happening in quite an unstructured way across multiple places, e.g.,

• not log-levels are being used
• the originating code part is not visible, except it is manually added to the log-message

Applied Changes

• move from go's log pkg to sirupsen/logrus
• add log-levels
• loglevel to be handed over during start of the pkg separately for the quantlum-layer and the proto-kms (using logrus instances)
• log.SetOutput(os.Stdout) to be set during boot, if log messages should not go to stdout
• log.SetFormatter() to be added
• use of log.SetReportCaller(true) to add origin code of the message to log-message in Trace level

kms/kms-keystore.go

@@ -3,9 +3,10 @@ package kms
 import (
 	"errors"
 	"fmt"
-	"log"
 	"sync"
 
+	log "github.com/sirupsen/logrus"
+
 	"code.fbi.h-da.de/danet/proto-kms/quantumlayer"
 )
 
@@ -36,7 +37,7 @@ func (ks *kmsKeyStore) addKey(bulkKeyId int64, keyToadd []byte) {
 	defer ks.keyStoreMutex.Unlock()
 	// test for collisions
 	if _, notThere := ks.keyStore[newKeyElement.keyID]; notThere {
-		log.Printf("Whop: addKey collission of key id %s for bulkKeyID %d", newKeyElement.keyID, bulkKeyId)
+		log.Errorf("Whop: addKey collission of key id %s for bulkKeyID %d", newKeyElement.keyID, bulkKeyId)
 		return
 	}
 	// ok to add