exclude site packages from buildout config
exclude site packages from buildout config

Change-Id: I8d3550690a91e9c364ed4228f152076e9130257c
Reviewed-on: http://review.couchbase.org/23614
Reviewed-by: Pavel Paulau <dd88eded64e90046a680e3a6c0828ceb8fe8a0e7@gmail.com>
Tested-by: Pavel Paulau <dd88eded64e90046a680e3a6c0828ceb8fe8a0e7@gmail.com>

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