Depth param for clone
    
    Added '--depth' argument for 'git clone' command. It creates a shallow clone
    with a history truncated to the specified number of commits. Additional
    parameter '--no-single-branch' is added together with '--depth' to apply
    history truncation to all cloned branches.
    
    JIRA: COMPOSE-2812
    Fixes: #363
    
    Signed-off-by: Ondrej Nosek <onosek@redhat.com>