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1. Why is this change necessary?

- There is a need to reduce the time taken for the integration test suite execution
  that is triggered by jenkins. This should be approached in different ways, one way
  being - loading pre-pulled test images just before tests, so as to avoid pulling a
  test image freshly during the suite

- This commit addresses the above by introducing the following :

  a) Ansible role and playbook to pull test images specified by a list
  b) Ansible role and playbook to load this into test k8s nodes (vagrantVM /baremetal)
  c) Updates to ci.yml to include load step
  d) Updates to global var specification file all.yml to hold some test labels

2. How does this change address the issue?

- Expected to reduce test time by having the image tar file ready

- The load step, where the images are loaded into the test nodes via docker load command
  takes time on the vagrant VMs. Need to identify machines w/ better resource OR a more
  optimal load technique.

  Sometimes , docker load can be a bursty Write spike on the VM storage which can take
  up system resources making the process slow. One approach is to have multiple load operations
  than one single large load. This will also help with versioning/maintenance of test images.

  However, the current changes will first have to be tested to identify the efficacy before moving
  on to enhancements. This is yet to be done due to certain issue on the local jenkins setup.

3. What side effects does this change have?

- None on the product itself. This is test code