[plugins/ceph] Don't trigger ceph_common on cinder nodes

[nkshirsagar]

ceph_common is triggered due to librados2 package on cinder nodes, so remove librados2 packages trigger for ceph_common plugin.

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[packit-as-a-service]

Congratulations! One of the builds has completed. 🍾

You can install the built RPMs by following these steps:

• sudo yum install -y dnf-plugins-core on RHEL 8
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• And now you can install the packages.

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