update copyright string
update copyright string

Change-Id: Ib3175409e14908d5c4d68f0e0a67f2ef56bd1448
Reviewed-on: http://review.couchbase.org/23827
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Pavel Paulau <dd88eded64e90046a680e3a6c0828ceb8fe8a0e7@gmail.com>

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