CBL-1717, clean up unwanted data potentially left behind by older builds.
CBL-1717, clean up unwanted data potentially left behind by older builds.

-Ming Ho

couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios