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

[LEDE Bugs]

The following task has a new comment added:

FS#246 - OpenVPN: add capath option to UCI
User who did this - Hanz (hanz)

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I used to add 'capath cafile' to the end of line 110 right after 'ca',
but I guess the order doesn't matter in terms of functionality.

Worked fine for me.
Please push the patch to the tree.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=246#comment709