In a previous commit [0] there was an additional character
escaping added at the end that was not added to the list
in the comment for the function. This change adds the missing
character to the list of escaped characters from the previous
change.
[0] https://review.openstack.org/#/c/439897/
Change-Id: I6e83a10ee51f1f18176bf2d17a0092d5a3cc4dd4