Do not clone the same repository multiple times, re-use already cloned repository
    
    Clone the directory to the compose tmp directory
    Update the test_scm in order to create real Compose object. Mock objects are not allowed
    to create/delete files for preventing multiple clones
    
    JIRA: RHELCMP-5250
    
    Signed-off-by: Ozan Unsal <ounsal@redhat.com>