[FS#246] OpenVPN: add capath option to UCI

[LEDE Bugs]

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FS#246 - OpenVPN: add capath option to UCI
User who did this: john (john)
Status: Unconfirmed -> Waiting on reporter

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=246