Don't vote with gate-tripleo-deploy yet.

There's no point, as it's not known to work. Once experimental
usefully does something everytime, we'll make it a check that doesn't
vote, then once it's got low false negatives, we'll make it a voting
check, then a gate.

Change-Id: Ie61335e970358c113a2a0e0b547f5510b2d65b5b