Removed most of mirrors-related code from master.php.net

Hello guys, I had some spare time and wanted to fix a couple of bugs related to notes management on master.php.net but then I noticed that Mirrors tab that is neither updated or used since we switched to MyraCloud (kudos to everyone involved!) I removed the code which seemed safe to remove and tried to keep at least reasonable BC in places that would be dangerours (like the API endopoint or fetch/mirrordns.php which might be still called from somewhere. I decided to remove scripts/mirror-(summary|test) altogether because they only seemed to update database wrt. to the management page that is surely no longer needed. For the /network/status/index.php I added the redirect to the php.net homepage because it looks to me like it's mapped to the status.php.net subdomain. Since I don't have a way (nor right) to remove it I went with what seemed like a safe approach. If I still broke something make sure to point it at me and I will try to fix what's broken. If something went terribly wrong here is the commit you can revert[1] On the other hand, if there's someone with better knowledge (or perhaps even actual access to the master box) I could only encourage to clean it up more aggresively after making sure the aforementioned scripts are really as unused as they seem to me. I know the sad state of master.php.net (heck, I even recall the PHP its PHP version situation) but I thought that some housekeeping wouldn't hurt. Hopefully I'm right and I didn't went too far. Cheers and have a good day/night! Maciej [1]: http://git.php.net/?p=web/master.git;a=commitdiff;h=54328e85c23e296dfd79f62a0d032fd1586c9c83