Cherry pick from https://review.openstack.org/#/c/43521/

Fix figure filenames for customzing dashboard

FTP was unable to maintain emdash in file name,
removes emdash from file name and changes xml
source reference. Should be backported to
stable/grizzly also.

Fix bug 1210371

Change-Id: I76fc632ae95553f7a55ff6444429c9c2c940764f