Update integration tests to use latest Jenkins LTS release
Update integration tests to use Chef 12.0.0.rc.1
Replace service notifications with runit_service.

At the 1.0 release, the runit cookbook replaced it's definition with a
resource and provider that extend the built-in chef service resource.
However, it provided a wrapper for users, that created a generic service
resource. This generic resource also ignored settings passed (like the
timeout setting in runit). This commit replaces all of the instances of
`notifies :foo, 'service[jenkins]'` with `notifies :foo, 'runit_service[jenkins]'`.