This commit introduces two configuration changes:
* The 'raw' attribute for links in GRAFANA_LINKS which allows
the user to point the dashboard URLs specified through
GRAFANA_LINKS at arbitrary paths or URLs without further
modification. This is False by default, which means the
'fileName' and 'path' attributes are considered to be
database or JSON file names to be inserted into a URL.
* The SHOW_GRAFANA_HOME setting which controls whether the
"Grafana Home" button is displayed or not. By default this
is True and the button is shown.
Change-Id: I55660f91fd56eb22dd7ad4674af422aeb2ba2ea3
8aa1cccf29