OpenShift 3.7 has a bug [1] that prevents from updating metadata of pods
created without any Controller (e.g. through `kubectl apply -f
pod-def.yaml` with ServiceAccount credentials. This prevents
containerized Kuryr to apply annotations onto such pods.
As this is only fixed in 3.9 now, we'll raise default OpenShift version
in DevStack.
As our version compatibility docs say nothing about OpenShift, we can
just state that we support 3.9+ starting with next release.
Closes-Bug: 1765132
[1] https://bugzilla.redhat.com/show_bug.cgi?id=1383707
Change-Id: Ia19c5a556085c13b70ae5f6bcd8538adce261fae
bcff4efaec