[CI] Minor updates for cloud CI

- Update the links to cloud CI with the latest ones using scripts managed by Antrea
- Bump up GKE cluster version

ci/jenkins/README.md

@@ -15,7 +15,7 @@ by this management cluster. As soon as the build finishes, the cluster
 should be deleted. This ensures that all tests are run on a clean testbed.
 
 ### List of Jenkins jobs
-[![Build Status](http://jenkins.antrea-ci.rocks/buildStatus/icon?job=cloud-antrea-eks-conformance-test-native&subject=EKS%20Conformance/NetworkPolicy)](http://jenkins.antrea-ci.rocks/view/cloud/job/cloud-antrea-eks-conformance-test-native/) [![Build Status](http://jenkins.antrea-ci.rocks/buildStatus/icon?job=cloud-antrea-gke-conformance-native&subject=GKE%20Conformance/NetworkPolicy%20)](http://jenkins.antrea-ci.rocks/view/cloud/job/cloud-antrea-gke-conformance-native/)
+[![Build Status](http://jenkins.antrea-ci.rocks/buildStatus/icon?job=cloud-antrea-eks-conformance-net-policy&subject=EKS%20Conformance/NetworkPolicy)](http://jenkins.antrea-ci.rocks/view/cloud/job/cloud-antrea-eks-conformance-net-policy/) [![Build Status](http://jenkins.antrea-ci.rocks/buildStatus/icon?job=cloud-antrea-gke-conformance-net-policy&subject=GKE%20Conformance/NetworkPolicy%20)](http://jenkins.antrea-ci.rocks/view/cloud/job/cloud-antrea-gke-conformance-net-policy/)
 * [e2e [gated check-in]](https://jenkins.antrea-ci.rocks/job/antrea-e2e-for-pull-request/):
   [end-to-end tests](/test/e2e) for Antrea.
 * [conformance [gated check-in]](https://jenkins.antrea-ci.rocks/job/antrea-conformance-for-pull-request/):
@@ -41,21 +41,21 @@ should be deleted. This ensures that all tests are run on a clean testbed.
 * Jenkins jobs validator [gated check-in]: this job only executes for PRs that include changes to
   [ci/jenkins/jobs](/ci/jenkins/jobs). It validates the syntax of the jenkins jobs'
   configuration.
-* [EKS conformance/network policy [bi-daily]](http://jenkins.antrea-ci.rocks/view/cloud/job/cloud-antrea-eks-conformance-test-native/)
+* [EKS conformance/network policy [bi-daily]](http://jenkins.antrea-ci.rocks/view/cloud/job/cloud-antrea-eks-conformance-net-policy/)
   community tests on EKS cluster using sonobuoy, focusing on "Conformance" and "Feature:NetworkPolicy", skipping the same regexes as in job __conformance__ above, as well as "NodePort" (See [#690](https://github.com/vmware-tanzu/antrea/issues/690)).\
   Current test environment matrix:
 
   |  K8s version |    Node type    |  Node AMI Family |  Status  |
   | :----------: | :-------------: | :--------------: | :------: |
-  |     1.15     |  EC2 t3.medium  |   AmazonLinux2   |[![Build Status](http://jenkins.antrea-ci.rocks/buildStatus/icon?job=cloud-antrea-eks-conformance-test-native)](http://jenkins.antrea-ci.rocks/view/cloud/job/cloud-antrea-eks-conformance-test-native/)|
+  |     1.15     |  EC2 t3.medium  |   AmazonLinux2   |[![Build Status](http://jenkins.antrea-ci.rocks/buildStatus/icon?job=cloud-antrea-eks-conformance-net-policy)](http://jenkins.antrea-ci.rocks/view/cloud/job/cloud-antrea-eks-conformance-net-policy/)|
 
-* [GKE conformance/network policy [bi-daily]](http://jenkins.antrea-ci.rocks/view/cloud/job/cloud-antrea-gke-conformance-native/)
+* [GKE conformance/network policy [bi-daily]](http://jenkins.antrea-ci.rocks/view/cloud/job/cloud-antrea-gke-conformance-net-policy/)
   community tests on GKE cluster using sonobuoy, focusing on "Conformance" and "Feature:NetworkPolicy", skipping the same regexes as in job __conformance__ above.\
   Current test environment matrix:
 
   |  K8s version   |     Node OS     | VPC Native Mode (on by default) |  Status  | 
   | :------------: | :-------------: | :-----------------------------: |:-------: |
-  | 1.15.12-gke.3  |     Ubuntu      |  On                             |[![Build Status](http://jenkins.antrea-ci.rocks/buildStatus/icon?job=cloud-antrea-gke-conformance-native)](http://jenkins.antrea-ci.rocks/view/cloud/job/cloud-antrea-gke-conformance-native/)|
+  | 1.16.11-gke.5  |     Ubuntu      |  On                             |[![Build Status](http://jenkins.antrea-ci.rocks/buildStatus/icon?job=cloud-antrea-gke-conformance-net-policy)](http://jenkins.antrea-ci.rocks/view/cloud/job/cloud-antrea-gke-conformance-net-policy/)|
 
 
 If you need to run the K8s community tests locally, you may use the

ci/jenkins/jobs/projects.yaml

@@ -467,7 +467,7 @@
               # gcloud auth login requires verification code from url
               ${{GCLOUD_PATH}} auth activate-service-account --key-file=${{GCLOUD_KEY_PATH}}
               sudo ./ci/test-conformance-gke.sh --cluster-name antrea-gke-${{BUILD_NUMBER}} \
-                --k8s-version 1.15.12-gke.3 --svc-account antrea-gcp@antrea.iam.gserviceaccount.com
+                --k8s-version 1.16.11-gke.5 --svc-account antrea-gcp@antrea.iam.gserviceaccount.com \
                 --gcloud-path ${{GCLOUD_PATH}} --setup-only
           triggers:
           - timed: H H */2 * *