Enable ovirt-imageio builds in travis

We have lot of tests that can work only on travis, and we use travis to run
with private forks like:
https://travis-ci.org/github/nirs/ovirt-imageio/builds

I tried to add a webhook to enable builds on:
https://travis-ci.org/github/oVirt/ovirt-imageio

But it seems that I don't have enough permissions on travis
to enable the build.

Please enable travis build for this project.

Nir