Public bug reported:

When the sla-len is not provided in the config file it is assumed the ISP will 
allocate a /48 and wide-dhcpv6 will assume the site level aggregator is always 
16 bits.
If the ISP only allocates a /56 and the sla-len is not set to 8, then an error 
is generated.

This patch prevents the error from being displayed and instead calculates the 
sla-len.
so for /48, 64-48 is 16
and /56 64-56 = 8
/60 is 4 etc.

This means that the configuration file is works without the sla-len
being specified even when the Prefix Delegated is not and exact /48.

** Affects: wide-dhcpv6 (Ubuntu)
     Importance: Undecided
         Status: New

** Patch added: "wide-dhcpv6-0008-Make-sla-len-config-optional.patch"
   
https://bugs.launchpad.net/bugs/1419224/+attachment/4314059/+files/wide-dhcpv6-0008-Make-sla-len-config-optional.patch

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https://bugs.launchpad.net/bugs/1419224

Title:
  Make sla-len config optional

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