Debos requires mountpoint options to be a list; they are ignored
silently if it isn't.

Apertis: https://phabricator.apertis.org/T4664



Signed-off-by: Andrew Shadura <andrew.shadura@collabora.co.uk>
Reviewed-by: Denis Pynkin <denis.pynkin@collabora.com>
Differential Revision: https://phabricator.apertis.org/D7702