Pull Cloud Trace demo app from google-samples (GoogleCloudPlatform#7634)

Co-authored-by: Yoshi Yamaguchi <[email protected]>

Author: bourgeoisor

trace/cloud-trace-demo-app/app/demo-service-a.yaml

@@ -31,7 +31,7 @@ spec:
     spec:
       containers:
       - name: cloud-trace-demo-container
-        image: gcr.io/cloud-trace-demo/demo-image:latest
+        image: gcr.io/google-samples/cloud-trace-demo:latest
         command:
         - python
         args:

trace/cloud-trace-demo-app/app/demo-service-b.yaml.template

@@ -17,7 +17,7 @@ spec:
     spec:
       containers:
       - name: cloud-trace-demo-container
-        image: gcr.io/cloud-trace-demo/demo-image:latest
+        image: gcr.io/google-samples/cloud-trace-demo:latest
         command:
         - python
         args:

trace/cloud-trace-demo-app/app/demo-service-c.yaml.template

@@ -17,7 +17,7 @@ spec:
     spec:
       containers:
       - name: cloud-trace-demo-container
-        image: gcr.io/cloud-trace-demo/demo-image:latest
+        image: gcr.io/google-samples/cloud-trace-demo:latest
         command:
         - python
         args: