Adapt jobs to integrate yardstick

Adapt jobs to integrate yardstick

Integrating yardstick requires all jobs to be adapted accordingly.
- cloud-infra-test.sh: we now started using arguments to set values
explicitly.
- cloud-infra-periodic-engine.yaml: periodic runs now include yardstick
as well. it is ok to run yardstick kubernetes testing but it will probably
not work with an openstack deployment due to lower performance of virtual
deployments.
- cloud-infra-verify-engine.yaml: additional parameters are declared to
set variables explictly.
- cloud-infra-verify-test.yaml: we now verify changes coming to infra/test
repo for both of the test frameworks, functest and yardstick, to ensure
changes do not cause problems for any of these.

Change-Id: I2ec82bc7c0424ca190dcf51d032eec5e52855062