Add support for beast ssl_reload in tentacle

[johnramsden]

Related to #697, #673

Unfortunately there is no current way of actually reloading certificates live. SIGHUP has no effect. There is a ssl_reload option for beast but it is only available in tentacle ceph/ceph#65842.

Note: Once we have migrated to tentacle, we can add functionality that supports auto reload. I propose what we should do here is have a reload occurring every 24 hours and issue a warning saying certificates will be updated in the background every 24 hours if the user does not issue the restart flag.

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CEPH-1702.

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