MB-9000 Retry open_db operation with the create option.

When an open_db operation without a create option fails
with FILE_NOT_FOUND error constantly, we should open a database
file with a create option to support subsequent read / write
operations.

Change-Id: I30dac3f0d7dda1c32c99bdebb4a99aef09c8a577
Reviewed-on: http://review.couchbase.org/28717
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Chiyoung Seo <chiyoung.seo@gmail.com>