Allow ovn-encap-tos to be configured

[umago]

This patch allows for the ovn-encap-tos to be configured in ovn-controller.

By default this option has the value of 0, as per OVS options:tos description [0], but it could also contain the word "inherit" therefore the field type for this patch is "str".

[0] options : tos: optional string Optional. The value of the ToS bits to be set on the encapsulat‐ ing packet. ToS is interpreted as DSCP and ECN bits, ECN part must be zero. It may also be the word inherit, in which case the ToS will be copied from the inner packet if it is IPv4 or IPv6 (otherwise it will be 0). The ECN fields are always inherited. Default is 0.

http://www.openvswitch.org/support/dist-docs/ovs-vswitchd.conf.db.5.txt

Resolves: OSPRH-6712

[booxter]

/lgtm

[karelyatin]

/lgtm

It's required for Beta automation blocker, so should be fine to get in.

I originally thought it would require changes in both ovn-operator and here to configure tunnel interfaces on both control plane and data plane. But seems configuring it here automatically get applies everywhere.

[karelyatin]

/hold

/lgtm

It's required for Beta automation blocker, so should be fine to get in.

I mistook it as Beta automation blocker, while the parent Epic was targetted for GA, so we can target it after beta freeze

[booxter]

/hold cancel

[openshift-ci[bot]]

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