Remove duplicate code.
Watchdog: check if previously already banged before proceeding.
Add test for Watchdog: check if previously already banged before proceeding.
Move getWatchdogId to a constant in slapgrid.
Move mock to slapmock to be explicit.

an absolute mock module is already used.
Fill changelog.
CLI: must_be_root: extract logic to own function.
CLI: supervisor command: allow to bypass root check.
CLI: fix root check for slapgrid and format.