remove useless prefix config parameter in documentation

debian/dhcpy6d.logrotate

@@ -0,0 +1,9 @@
+/var/log/dhcpy6d.log {
+	weekly
+	missingok
+	rotate 4
+	compress
+	notifempty
+	create 660 dhcpy6d dhcpy6d
+}
+

doc/dhcpy6d-example.conf

@@ -198,8 +198,6 @@ information_refresh_time = 3600
 
 # a globally unique address
 [address_global] 
-# Prefix length can be up to 64.
-prefix_length = 64
 # For privacy a global address might better be randomly created.
 category = random
 # This pattern results in an address like this:
@@ -214,8 +212,6 @@ valid_lifetime = 43200
 
 # A unique local address
 [address_local_valid]
-# Prefix length can be up to 64.
-prefix_length = 64
 # For easier internal management put MAC address into address.
 category = mac
 # Given MAC 01:02:03:04:05:06 this pattern results in an address
@@ -241,8 +237,6 @@ nameserver = fd01:db8::53
 # 2. Example: definition of a class for invalid clients
 
 [address_local_invalid]
-# Prefix length can be up to 64. This is the default.
-prefix_length = 64
 # Invalid clients will get addresses of a range.
 category = range
 # Definition of range.
@@ -268,8 +262,6 @@ t2 = 900
 # 3. Example: definition of filtered clients
 
 [address_filtered]
-# Prefix length can be up to 64.
-prefix_length = 64
 # Filtered clients will get addresses of a range.
 category = range
 # Definition of range.
@@ -299,8 +291,6 @@ filter_hostname = windows.*
 # extra nameservers etc. a class_default has to be set.
 
 [address_default]
-# Prefix length can be up to 64.
-prefix_length = 64
 category = mac
 # Given MAC 01:02:03:04:05:06 this pattern results in an
 # address like this: fd01:db8:dead:0bad:beef:0102:0304:0506.

man/man5/dhcpy6d.conf.5

@@ -244,10 +244,6 @@ This is why the range can span from 0000-FFFF. Clients will get an address out o
 - A 64 bit random address will be generated in place of this variable. Clients get a random address just like they would
 if privacy extensions were used. The random part will span over 4 octets.
 
-.TP
-.B prefix_length = <0-128>
-Default prefix length for addresses is 64 but it can be customized here.
-
 .TP
 .B ia_type = na | ta
 IA (Identity Association) types can be one of non-temporary address "na" or temporary address "ta". Default and probably most used is "na".