When a messaging output is set to forced, users should not be able to change
that. Regression intoroduced in bb3546f3 made possible to change checkboxes
(but not avoid forced settings). This fix replace checkboxes for 'forced'
settings with the corresponding message, similar to how it worked for
disallowed before.
Existing user messaging preferences should accomodate default settings and
permissions. This also includes some changes to default outputs preferences.
Signed-off-by: Ruslan Kabalin <ruslan.kabalin@luns.net.uk>
This introduces the new page where admin may change the permissions and
defaults for particular combination of message processors and providers.
Signed-off-by: Ruslan Kabalin <ruslan.kabalin@luns.net.uk>