don't duplicate requirements
don't duplicate requirements

version of twisted is already specified in spring package

Change-Id: Id57660bca63cced9c2dd247eea32b318bd5c2e2e
Reviewed-on: http://review.couchbase.org/36683
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Pavel Paulau <dd88eded64e90046a680e3a6c0828ceb8fe8a0e7@gmail.com>

PaintScratcher/perfrunner,EricACooper/perfrunner,couchbase/perfrunner,pavel-paulau/perfrunner,pavel-paulau/perfrunner,mikewied/perfrunner,mikewied/perfrunner,couchbase/perfrunner,EricACooper/perfrunner,dkao-cb/perfrunner,thomas-couchbase/perfrunner,couchbase/perfrunner,pavel-paulau/perfrunner,thomas-couchbase/perfrunner,PaintScratcher/perfrunner,EricACooper/perfrunner,pavel-paulau/perfrunner,hsharsha/perfrunner,vmx/perfrunner,couchbase/perfrunner,couchbase/perfrunner,EricACooper/perfrunner,hsharsha/perfrunner,dkao-cb/perfrunner,vmx/perfrunner,pavel-paulau/perfrunner,couchbase/perfrunner