Add tcptype to Candidate toString method

Author: jalaziz

src/main/java/org/ice4j/ice/Candidate.java

@@ -776,6 +776,10 @@ public String toString()
             buff.append(" rport ").append(relAddr.getPort());
         }
 
+        if(getTcpType() != null) {
+            buff.append(" tcptype ").append(getTcpType());
+        }
+
         return buff.toString();
     }
 

src/main/java/org/ice4j/ice/sdp/CandidateAttribute.java

@@ -137,6 +137,10 @@ public String getValue()
             buff.append(" rport ").append(relAddr.getPort());
         }
 
+        if(candidate.getTcpType() != null) {
+            buff.append(" tcptype ").append(candidate.getTcpType());
+        }
+
         return buff.toString();
     }