Remove backup XATTR tests from pipeline
Remove backup XATTR tests from pipeline

Upon testing them, the XATTR tests are taking a very long time to
load. Removing them for the time being so they don't clog the
weekly pipeline.

Change-Id: I06cc2bc3949a500bdec8b72cebf8139e3578c83c
Reviewed-on: http://review.couchbase.org/110370
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Daniel Owen <b3fc0e1a51f252986e60be7da121b74d3ac6845f@couchbase.com>

couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner