Temporarily disable use of sqlite db for autopkgtests

The initial db population for the series takes quite a while, so to not block
on this for the release opening process we can let britney talk directly to
swift in the short term.

britney.conf

@@ -104,7 +104,7 @@ ADT_SWIFT_URL     = https://autopkgtest.ubuntu.com/results/
 # Base URL for autopkgtest site, used for links in the excuses
 ADT_CI_URL        = https://autopkgtest.ubuntu.com/
 # URL for the autopkgtest database, if used
-ADT_DB_URL        = https://autopkgtest.ubuntu.com/static/autopkgtest.db
+#ADT_DB_URL        = https://autopkgtest.ubuntu.com/static/autopkgtest.db
 ADT_HUGE          = 20
 
 # Autopkgtest results can be used to influence the aging