ClusterLoader: update README
ClusterLoader: update README

Remove reference to govendor

shyamjvs/perf-tests,kubernetes/perf-tests,kubernetes/perf-tests,kubernetes/perf-tests,shyamjvs/perf-tests,kubernetes/perf-tests,shyamjvs/perf-tests,shyamjvs/perf-tests,shyamjvs/perf-tests,kubernetes/perf-tests