OpenShiftSDN: introduce OVS anti-selector

[phoracek]

OpenShiftSDN is shipped with its own openvswitch service running
as a separate daemonset. However, in some cases we may want to use
an external openvswitch running on the host (e.g. to use it for
host networking). In order to support a mixed environment where some
hosts have this external service and some don't, we introduce
openvswitch anti-selector:

network.operator.openshift.io/external-openvswitch

Note that this selector has to be set before the operator is started.
Otherwise, the label would not take effect on already scheduled
pods.

TODO: documentation

Signed-off-by: Petr Horacek phoracek@redhat.com

[squeed]

TODO: consider doing the same for OVN, the issue there is that OVS is not a separate DS, but a container under OVN DS

If you file a corresponding PR for OVN, I'd merge it. Note that you'll have to adjust some bindmounts as well.

[mmirecki]

If you file a corresponding PR for OVN, I'd merge it. Note that you'll have to adjust some bindmounts as well.

PR for ovn: #357

[mmirecki]

Documented in PR 375

[phoracek]

Thanks @mmirecki!

@squeed can we move this forward now?

[squeed]

/approve
/lgtm

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