Using allow_deploy in easybib-recipe

I need to remove the static cluster name check in the recipe to have easybib deployed on Easybib Loadtest. The cluster name check is still being done in the easybib-library in allow_deploy. This change fixes by accident easybib/issues#107, too :)

@till I am not sure about the "testapp" check. I just migrated it from the old recipe, but since we currently do not have any testapp application in the config, I guess this is some old leftover, so we could simplify here even further.

fixes easybib/issues#107