Update cockpit-machines to version 270.2 / rev 7 via SR 983413
    
    https://build.opensuse.org/request/show/983413
    by user adamm + dimstar_suse
    - load-css-overrides.patch: css overrides for better theming support
    
    - Update to 271.2:
      * Fix test/reference setup in release tarball for tests
    
    - Update to 271.1:
      https://github.com/cockpit-project/cockpit-machines/releases/tag/270.1
    
    - Update to 264:
      https://github.com/cockpit-project/cockpit-machines/releases/tag/264