cilium / cilium / 9655
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ianvernon 
test: use kvstore-based allocator for upgrade tests

The upgrade test in the CI was sporadically failing when performing the upgrade
from `v1.5` to the latest version of Cilium, with errors like the following:

```
2019-07-29T23:07:13.582080226Z level=warning msg="Key allocation attempt failed" attempt=11 error="unable to reserve local key 'k8s:app=migrate-svc-client;k8s:io.cilium.k8s.policy.cluster=default;k8s:io.cilium.k8s.policy.serviceaccount=default;k8s:io.kubernetes.pod.namespace=default;k8s:zgroup=migrate-svc;': local key already allocated with different value (6696 != 38347)" key="[k8s:app=migrate-svc-client k8s:io.cilium.k8s.policy.cluster=default k8s:io.cilium.k8s.policy.serviceaccount=default k8s:io.kubernetes.pod.namespace=default k8s:zgroup=migrate-svc]" subsys=allocator
2019-07-29T23:07:47.293412631Z level=warning msg="Unable to restore endpoint" endpointID=823 error="exponential backoff cancelled via context: context deadline exceeded" subsys=daemon
```

By default in master, we use the CRD-based identity allocator. The upgrade path
from using the kvstore-based allocator (which is on by default in `v1.5`) to the
CRD-based allocator is not officially supported. So, make sure that in the
upgrade test, we are still using the kvstore-based allocator. The CRD alloaction
mode will still be used in the rest of the CI, as we delete the Cilium DaemonSet
and clear all Cilium state when the upgrade test finishes up.

This is a band-aid over the real problem that we do not support the upgrade path
yet. We should revert this patch once we support changing the allocator backend
when upgrade occurs.

Fixes: #8727

Signed-off by: Ian Vernon <ian@cilium.io>

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