add pep8 to buildout config
add pep8 to buildout config

Change-Id: Id77722bb1eee4baa2f2cd663ad4658e60886e19a
Reviewed-on: http://review.couchbase.org/23689
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Pavel Paulau <dd88eded64e90046a680e3a6c0828ceb8fe8a0e7@gmail.com>

couchbase/cbagent,vmx/cbagent,mikewied/cbagent,ronniedada/litmus,couchbase/cbmonitor,pavel-paulau/cbagent,ronniedada/litmus,couchbase/cbmonitor