Automatic merge from submit-queue
Migrate gke-trusty test jobs to 1.2
Following up #23100 and #23139, #23319, migrate all gke-trusty jobs to the
`release-1.2` branch, add parallel and subnet test jobs, and bump timeouts
accordingly.
Tested with `jenkins-jobs test`. Manually diff'ed gke-trusty jobs against their equivalent gke jobs. For example,
```
# diff /tmp/jobs0324/kubernetes-e2e-gke-test /tmp/jobs0324/kubernetes-e2e-gke-trusty-test
4c4
< <description>Run E2E tests on GKE test endpoint. Test owner: GKE on-call.<!-- Managed by Jenkins Job Builder --></description>
---
> <description>Run E2E tests on GKE test endpoint. Test owner: wonderfly@google.com.<!-- Managed by Jenkins Job Builder --></description>
49c49
< export PROJECT="k8s-jkns-e2e-gke-test"
---
> export PROJECT="kubekins-e2e-gke-trusty-test"
51a52
> export E2E_NAME="jkns-gke-e2e-test-trusty"
228c229
< <recipientList>$DEFAULT_RECIPIENTS</recipientList>
---
> <recipientList>wonderfly@google.com,qzheng@google.com</recipientList>
```
@spxtr @roberthbailey @ihmccreery Can you review this?
cc/ @andyzheng0831