Added tesora to Planet OpenStack

Change-Id: Ia6db37078f78ad898f66f602823026f1b94dca60
Revert Tesora blog

Tesora's feed contains badly-form URLs like:
http://tesora.com/%3Ca%20href%3D%22/blog/TITLE%22%3Eview%3C/a%3E

Change-Id: I4c9380ff09b725d4ca287610359b51281ef227b6