CI: Move test group config files to Jenkins

CI: Move test group config files to Jenkins

One of the downaides of having things like test configuration
in the git repo is that it can't be changed at runtime.  You have
to create a review for the changes and merge it mefore it will
take effect.

This review moves the data currently held in
tests/CI/periodic-dailyTestGroups.json and
tests/CI/gateTestGroups.json into a Jenkins Config File attached
to the job definitions.  This allows us to alter it from the
Jenkins UI at runtime.  The original files stay in the repo
as documentation.

Change-Id: I14b9702f6285ce1fb2420287ba0e7d3b59109763