Enable arm vpp master testing in ci

Juraj Linkeš <juraj.linkes@...>



We're trying to enable testing for vpp master on ARM in CI. Here's the patch: https://gerrit.fd.io/r/#/c/15251/


All of the affected jobs have been tested in sandbox and are working well. Please review the patch and give it a +1 if you think it's okay so that Ed can finally merge it.