Some minor cleanups of sites that have fewer than 25% of the files
we try to fetch from them.

MASTER_SITE_KDE:
remove ftp.tu-clausthal.de; it no longer has a /pub/mirror/kde directory.

MASTER_SITE_SUSE:
remove ftp.linux.org.tr; it has 0 of the 58 files we fetch from suse.
remove ftp.uni-bremen.de; it has 3 of the 58 files we fetch from suse
remove linux.mathematik.tu-darmstadt.de; it has 3 of the 58 files we

fetch from suse

change ops.tamu.edu to mirror.tamu.edu to chase a 302 redirect.

MASTER_SITE_NETBSD:
remove ftp.weird.com; it has 5 of the 41 files we fetch from netbsd.