[FS#402] odhcpd: assign all viable DHCPv6 address in stateful+stateless mode

[LEDE Bugs]

The following task has a new comment added:

FS#402 - odhcpd: assign all viable DHCPv6 address in stateful+stateless mode
User who did this - Eric Luehrsen (EricLuehrsen)

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A bug is also found within this behavior. FS#524.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=402#comment1845