[FS#967] odhcp: does not honor 'ignore' on the dhcp section

[LEDE Bugs]

The following task has a new comment added:

FS#967 - odhcp: does not honor 'ignore' on the dhcp section
User who did this - Alexander Couzens (lynxis)

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That looks "grown" to me. If I set a section to "ignore" this should be count for everything inside and not only for ipv4. If so, we should rename it for ignorev4
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=967#comment3423