Use latest Mobile CLI in nightly pipelines

Currently the nightly pipelines uses 1.0.0 release of Mobile CLI. They should be using latest (master branch).

How it currently works

Currently this jenkins agent is being used (1.0.0 is hard coded there):
https://github.com/feedhenry/wendy-jenkins-s2i-configuration/blob/master/agent-svcat/Dockerfile

Image is published in here:
https://quay.io/repository/feedhenry/jenkins-agent-svcat

Community Jenkins via Kubernetes plugin uses this image so that pipelines can be configured to run on slave where SVCAT and Mobile CLI are available.

What to do
I am not entirely sure here. We might modify the image to clone the master branch and install Mobile CLI from there. In quay.io it is also possible to "create build trigger" - it might be an option too.