Add unit tests for Kafka dissector (#807)

* Add unit tests for Kafka dissector

* Return `io.EOF` if request or response header size is zero

* Sort the slice in `representMapAsTable`

* Remove the dead code

* Remove more dead code

* Remove more dead code

* Fix `dissector.Analyze` call

Co-authored-by: gadotroee <55343099+gadotroee@users.noreply.github.com>

tap/extensions/kafka/helpers.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"reflect"
+	"sort"
 	"strconv"
 	"strings"
 
@@ -897,6 +898,10 @@ func representMapAsTable(mapData map[string]interface{}, selectorPrefix string,
 		})
 	}
 
+	sort.Slice(table, func(i, j int) bool {
+		return table[i].Name < table[j].Name
+	})
+
 	obj, _ := json.Marshal(table)
 	representation = string(obj)
 	return