
We don't need python cryptography bindings in order to deploy a Galera server therefore drop it from our dependencies. It also is no longer used inside OpenStack world for lack of security. Also, we make remote network hits to get the GPG keys which are quite unreliable so let's store them inside the role and use them. Change-Id: I9443f10e8c803599cbebfc2a53cb9c432bfa60d1