changed cberendt.de to cberendt.net

My blog moved from cberendt.de to cberendt.net.

Change-Id: Ib19b87342d7a072869d4f8ca007c77a4d9e9388e
fixed broken URLs

Not removed the following unreachable URLs.

* http://omgmike.com/rss?tag=openstack
* http://www.jordanrinke.com/category/work/openstack/feed/

Change-Id: I419a2c0bf920f7637f9974755cf9740a71e16681
Merge "changed cberendt.de to cberendt.net"