Add jobs to gather memory usage data
    
    Summary:
    This adds a new test, memory_check, which just does a default
    package set install with `inst.debug` parameter then uploads
    the memory usage file (`/tmp/memory.dat`) at the end. We can
    have check-compose use the data to analyze changes in memory
    usage over time.
    
    Test Plan:
    Fire off the Workstation network install image tests
    and make sure the memory usage test runs and works on all three
    machines. This is live on staging already.
    
    Reviewers: garretraziel_but_actually_jsedlak_who_uses_stupid_nicknames, jskladan
    
    Subscribers: tflink
    
    Differential Revision: https://phab.qa.fedoraproject.org/D1082