Move the percent character to the template from the string to allow
setting either % or %% as needed to work around the bug linked below.
This requires each service 'family' to have two versions of it's config
file.
Bug: https://bugs.launchpad.net/swift/+bug/1872553
Change-Id: I68f276224c51d5682d77123eae697767fadf9b19
Signed-off-by: Matthew Thode <mthode@mthode.org>