iniset: fix handling of values containg ampersand

Attempting to set a value containing the ampersand
character (&) by iniset would corrupt the value.
So, add an escaping process.

Signed-off-by: Nobuhiro MIKI <nmiki@yahoo-corp.jp>
Closes-Bug: #1983816
Change-Id: Ie2633bacd2d761d110e6cb12f95382325c329415
2 files changed