python: Don't report skipped tests
    
    In the short test summary, report only (x)failed and (X)passed tests.
    Skipped tests are normal, used when a test cannot run in the current
    environment. (x)failed or (X)passed tests must be fixed and should be
    listed.
    
    Signed-off-by: Nir Soffer <nsoffer@redhat.com>