[FS#853] Change dnsmasq domain and local options to lists

[LEDE Bugs]

The following task has a new comment added:

FS#853 - Change dnsmasq domain and local options to lists
User who did this - Jo-Philipp Wich (jow-)

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This patch will break LuCI support if applied as-is, please keep in mind to update LuCI as well if you're going to merge it.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=853#comment2835