VOL-4836 - Cosmetic edits to trigger a sanity check build.

Makefile
--------
  o Replace inlined rm -fr calls with make builtin $(RM) -r.

pkg/events/common.go
pkg/flows/flow_utils_test.go
pkg/grpc/client.go
pkg/kafka/common.go
pkg/platform/platform_test.go
vendor/go.etcd.io/etcd/embed/etcd.go
vendor/github.com/coreos/etcd/client/doc.go
vendor/github.com/grpc-ecosystem/go-grpc-middleware/doc.go
vendor/github.com/prometheus/client_golang/prometheus/doc.go
------------------------------------------------------------
  o Update copyright notice in source to trigger a jenkins job.

Change-Id: Ib679a56436d141571082cf000acc5fefc3cd7c88
7 files changed