[chore] - update kubernetes manifests to 1.7 release (open-telemetry#1305)

* update to 1.7 release

Signed-off-by: Pierre Tessier <pierre@pierretessier.com>

* add create namespace

Signed-off-by: Pierre Tessier <pierre@pierretessier.com>

---------

Signed-off-by: Pierre Tessier <pierre@pierretessier.com>
Co-authored-by: Juliano Costa <julianocosta89@outlook.com>

Author: puckpuck

Makefile

@@ -114,6 +114,11 @@ generate-kubernetes-manifests:
 	echo "# Copyright The OpenTelemetry Authors" > kubernetes/opentelemetry-demo.yaml
 	echo "# SPDX-License-Identifier: Apache-2.0" >> kubernetes/opentelemetry-demo.yaml
 	echo "# This file is generated by 'make generate-kubernetes-manifests'" >> kubernetes/opentelemetry-demo.yaml
+	echo "---" >> kubernetes/opentelemetry-demo.yaml
+	echo "apiVersion: v1" >> kubernetes/opentelemetry-demo.yaml
+	echo "kind: Namespace" >> kubernetes/opentelemetry-demo.yaml
+	echo "metadata:" >> kubernetes/opentelemetry-demo.yaml
+	echo "  name: otel-demo" >> kubernetes/opentelemetry-demo.yaml
 	helm template opentelemetry-demo open-telemetry/opentelemetry-demo --namespace otel-demo | sed '/helm.sh\/chart\:/d' | sed '/helm.sh\/hook/d' | sed '/managed-by\: Helm/d' >> kubernetes/opentelemetry-demo.yaml
 
 .PHONY: start