cloudkitty-dashboard has a few config options. Introduced the specific
class to manage these.
Note that current cloudkitty-dashboard has no policy handling, so
the portion to manage policy settings is not imported.
Closes-Bug: #2083320
Change-Id: Id20d214c2e4ad9adf3aa6e42982fbb2ba2ca4b75
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>