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Resolve "default preferred-lifetime"

Thomas Markwalder requested to merge 2835-default-preferred-lifetime into master

Closes #2835 (closed)

Remove the preferred-lifetime, global default, of 3600 seconds so it is unspecified add add a check that replaces the outbound value with 0.625 * valid-lifetime when it is unspecified or greater than valid-lifetime. This makes default behavior match ISC DHCP but goes step further by not allowing users to send an insane value that per RFC clients should reject.

Update the ARM accordingly.

Edited by Thomas Markwalder

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