Better HA information on the summary screen

[jrafanie]

We only check if there is a recovery.conf file, which would contain the upstream "primary" this standby is tracking. While this shows it's configured as a standby or primary, it doesn't mean HA is active.

I think we can add:

1. systemctl status repmgr10 - This should be started on standby, otherwise we'll never detect the primary is down and promote the standby. This is what gets started when you configure it as standby.
   Note, you can't start repmgr if the primary or this standby is down, so if this is failing to start, it's likely the primary or standby is not running or not yet running.

2. systemctl status evm-failover-monitor.service - For application appliances, this should be started if failover monitor is enabled. If this is failing to start, automatic failover won't happen.

3. We should try to show the output from "repmgr cluster show" somewhere