double quotes in Tunnel-Private-Group-Id

[Marc Boisis]

We migrate from freeradius 2.2.5 to a new server in 3.0.13
The attribute Tunnel-Private-Group-Id  come from same ldap server between the two freeradius server .

With 2.2.5 :
Access-Accept Id 105 from 10.10.10.21:1812 to 10.10.10.21:44901 length 0
	Tunnel-Private-Group-Id:0 = "2"
	Tunnel-Medium-Type:0 = IEEE-802
	Tunnel-Type:0 = VLAN




With 3.0.13 : 
Access-Accept Id 105 from 10.10.10.21:1812 to 10.10.10.21:44901 length 0
(20)   Tunnel-Type := VLAN
(20)   Tunnel-Medium-Type := IEEE-802
(20)   Tunnel-Private-Group-Id := "\"2\""


Why there is backslashed double quote in the value with the 3.0.13 and what can I do to remove them, my clients doesn't understand them ?
Thanks