Fix issues in config parser relating to lun serial numbers.

Without this fix some serial numbers needed to be quoted
to avoid the config parser bailing out.

Submitted by:	delphij
Sponsored by:	iXsystems

(cherry picked from commit 3211f93c4b301897d0f2122478b58783614c36d8)

Ticket: #5327
(cherry picked from commit b8c6ce7978212d7f7a556a61c5becc18b7a7fde7)