Add a "no" config knob for dhcp6-ll-wait - #349
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In scenarios where we need to start dhcp6 on several interfaces at once, the mandatory 1 second sleep can add an unacceptable amount of wait time. If an operator guarantees that a link local address for a given interface will exist before we try to start dhcp6, then the wait is not necessary. Add handling for passing "no" as a value to dhcp6-ll-wait (similar to what is done for the "dhcp-wait" knob), and skip the link-local addr check when this knob is configured. Signed-off-by: Anders Linn <anders@nexthop.ai>
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In scenarios where we need to start dhcp6 on several interfaces at once, the mandatory 1 second sleep can add an unacceptable amount of wait time. If an operator guarantees that a link local address for a given interface will exist before we try to start dhcp6, then the wait is not necessary. Add handling for passing "no" as a value to dhcp6-ll-wait (similar to what is done for the "dhcp-wait" knob), and skip the link-local addr check when this knob is configured.