Add obsoletes section in RPM spec to uninstall plugin packages.
Add obsoletes section in RPM spec to uninstall plugin packages.

opennode/waldur-mastermind,opennode/waldur-mastermind,opennode/nodeconductor-assembly-waldur,opennode/nodeconductor-assembly-waldur,opennode/waldur-mastermind,opennode/nodeconductor-assembly-waldur,opennode/waldur-mastermind