CBD-87: BFDSink.can_handle only checks dir-ness
CBD-87: BFDSink.can_handle only checks dir-ness

The emptiness of the directory is checked later in the BFDSink.check
method.

Change-Id: Id2e1b4e015ff1cb11f74cf38d54f6d5d28ff00cc
Reviewed-on: http://review.couchbase.org/17380
Reviewed-by: Pavel Paulau <dd88eded64e90046a680e3a6c0828ceb8fe8a0e7@gmail.com>
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

membase/membase-cli,membase/membase-cli,couchbase/couchbase-cli,couchbaselabs/couchbase-cli,couchbaselabs/couchbase-cli,couchbaselabs/couchbase-cli,membase/membase-cli,couchbase/couchbase-cli