Temporarily disable use of sqlite db for autopkgtests

The database is being regenerated after an outage.  swift is slow but
we can get results more directly instead of being blocked by another day+.

britney.conf

@@ -104,7 +104,7 @@ ADT_SWIFT_URL     = https://objectstorage.prodstack5.canonical.com/swift/v1/AUTH
 # 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