Change remaining uni07eta interfaces MTU to 9000

[renjingxiao]

This extends jumbo MTU to remaining interfaces to match 17.1 configuration.

Related-to: OSPRH-30634

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[renjingxiao]

This is tested on eta.

[abays]

@gthiemonge Any concerns regarding MTU change for the Octavia interfaces?
@karelyatin Any concerns from your end?

[gthiemonge]

@gthiemonge Any concerns regarding MTU change for the Octavia interfaces?

It should be fine, I guess jumbo frames are also enabled in Neutron.
@beagles WDYT?