[CI]: Run ygnmi after pyangbind to avoid threadkill (openconfig#1045)

Based on results in openconfig#1043 it
suggests an OOM issue.

cloudbuild.yaml

@@ -229,28 +229,28 @@ steps:
   waitFor: ['validator prep', 'go path creation', 'oc-pyang']
   id: 'goyang-ygot'
 
-############### YGNMI ###############
+############### PYANG ###############
 - name: 'us-west1-docker.pkg.dev/$PROJECT_ID/models-ci/models-ci-image'
   entrypoint: 'bash'
-  args: ['-c', "/go/src/github.com/openconfig/models-ci/validators/ygnmi/test.sh"]
+  args: ['-c', '/go/src/github.com/openconfig/models-ci/validators/pyang/test.sh']
   secretEnv: ['GITHUB_ACCESS_TOKEN']
-  volumes:
-  - name: 'gopath'
-    path: /go
   env:
   - 'GOPATH=/go'
   - '_PR_NUMBER=$_PR_NUMBER'
   - '_MODEL_ROOT=$_MODEL_ROOT'
   - 'COMMIT_SHA=$COMMIT_SHA'
   - '_REPO_SLUG=$_REPO_SLUG'
   - 'BRANCH_NAME=$BRANCH_NAME'
-  waitFor: ['validator prep', 'go path creation', 'oc-pyang']
-  id: 'ygnmi'
+  volumes:
+  - name: 'gopath'
+    path: /go
+  waitFor: ['validator prep', 'oc-pyang']
+  id: 'pyang'
 
-############### PYANG ###############
+############### PYANGBIND ###############
 - name: 'us-west1-docker.pkg.dev/$PROJECT_ID/models-ci/models-ci-image'
   entrypoint: 'bash'
-  args: ['-c', '/go/src/github.com/openconfig/models-ci/validators/pyang/test.sh']
+  args: ['-c', '/go/src/github.com/openconfig/models-ci/validators/pyangbind/test.sh']
   secretEnv: ['GITHUB_ACCESS_TOKEN']
   env:
   - 'GOPATH=/go'
@@ -263,25 +263,25 @@ steps:
   - name: 'gopath'
     path: /go
   waitFor: ['validator prep', 'oc-pyang']
-  id: 'pyang'
+  id: 'pyangbind'
 
-############### PYANGBIND ###############
+############### YGNMI ###############
 - name: 'us-west1-docker.pkg.dev/$PROJECT_ID/models-ci/models-ci-image'
   entrypoint: 'bash'
-  args: ['-c', '/go/src/github.com/openconfig/models-ci/validators/pyangbind/test.sh']
+  args: ['-c', "/go/src/github.com/openconfig/models-ci/validators/ygnmi/test.sh"]
   secretEnv: ['GITHUB_ACCESS_TOKEN']
+  volumes:
+  - name: 'gopath'
+    path: /go
   env:
   - 'GOPATH=/go'
   - '_PR_NUMBER=$_PR_NUMBER'
   - '_MODEL_ROOT=$_MODEL_ROOT'
   - 'COMMIT_SHA=$COMMIT_SHA'
   - '_REPO_SLUG=$_REPO_SLUG'
   - 'BRANCH_NAME=$BRANCH_NAME'
-  volumes:
-  - name: 'gopath'
-    path: /go
-  waitFor: ['validator prep', 'oc-pyang']
-  id: 'pyangbind'
+  waitFor: ['validator prep', 'go path creation', 'oc-pyang', 'pyangbind'] # wait for pyangbind to avoid possible OOM.
+  id: 'ygnmi'
 
 ############### COMPATIBILITY REPORT ###############
 - name: 'us-west1-docker.pkg.dev/$PROJECT_ID/models-ci/models-ci-image'