test/watchdog: Fix multi-object acquisition

The tests were mistakenly trying to acquire the same DBus path for
watchdog objects while older versions of the objects were still alive.
This fixes the issue by purging the old objects before creating new
ones.

Change-Id: I65bef2f0edab7057c05af9ecd31e554da6565184
Signed-off-by: William A. Kennington III <wak@google.com>
1 file changed