Makefile: Add a linting target that runs gofmt/goimports

Explicitly ignore operatorclient generated packages

The gofmt/goimport commands are touching generated packages that don't
have the proper "//go:generate ..." instructions.

Signed-off-by: timflannagan <timflannagan@gmail.com>

Makefile

@@ -184,6 +184,9 @@ clean:
  @rm -rf test/e2e/log
  @rm -rf e2e.namespace
 
+lint:
+ find . -name '*.go' -not -path "./vendor/*" -not -path "./pkg/lib/operatorclient/operatorclientmocks/*" | xargs gofmt -w
+ find . -name '*.go' -not -path "./vendor/*" -not -path "./pkg/lib/operatorclient/operatorclientmocks/*" | xargs goimports -w
 
 # Copy CRD manifests
 manifests: vendor