Ignore files in a cloned repository - patterns
    
    Git will ignore automatically generated files. Ignored patterns can be
    specified in config. Patterns are applied in '.git/info/exclude' file only
    when a repository is cloned. And changes are valid only for a local
    repository.
    Functionality is implemented in rpkg. This commit includes only patterns.
    
    Relates: COMPOSE-2794
    
    Signed-off-by: Ondrej Nosek <onosek@redhat.com>