Up2date replacement

[Don Springall]

Ok dropped "/var/cache/yum/timedhosts.txt" and "bestmirror.py" plugin now 
works. Thanks. Didn't see any messages about checksum errors so this is much 
better than "fastestmirror-persistent.py"

Willem Riede: please let me know if you have any updates to bestmirror.py in 
future. Thanks.
Perhaps we can get Fedora to add this to yum package if we get more people 
testing it.