Fix double-printing of motd.tail, LP: #550561 * debian/postinst.in: motd.tail should no longer be generated by this package; rather it's where the sysadmin would add static text to append to the dynamically generated /etc/motd * debian/update-motd.d/*, debian/rules: - move update-motd scripts to this dir, clean up install rules (scripts were getting installed in two places) - 00-header: add the lsb_release information, which seems at least as pertinent as the kernel's version and build-date - 00-header, 99-footer: split the header (uname, lsb_release) and the footer (admin's motd.tail) to two separate scripts