Update cockpit to version 271 / rev 19 via SR 983416
https://build.opensuse.org/request/show/983416
by user adamm + dimstar_suse
- css-overrides.patch: css overrides for better theming support
- new version 271
https://cockpit-project.org/blog/cockpit-271.html
- cockpit-redhatfont.diff: not needed, dropped
- 0001-selinux-allow-login-to-read-motd-file.patch, hide-docs.patch,
hide-pcp.patch remove-pwscore.patch: refreshed