Ceph commands the Ceph check runs to query cluster status need to access
/etc/ceph/ceph.client.admin.keyring. To that end one can either add
monasca-agent to the ceph group or run monasca-agent as root. This
commit adds the use_sudo configuration option that runs ceph commands
using sudo. This is useful if your agent has sudo rights anyway due to
other plugins that require it (e.g. postfix).
Change-Id: I24075359f7090f02577cd22a1b3badcbe7041302
41a0e49757
