Check smart-restart on dev and install it on all servers

[alinvetian]

Following: #3331

Check smart-restart behavior on dev servers and if all is OK install it on all stage and production machines

[ahamelers]

I usually deregister an instance from the load balancer target group before restarting, so people who may be using it aren't disrupted. Does smart-restart do this, or would we have to be careful to deregister from the load balancer before doing any dnf upgrade?

[ahamelers]

I just did a dnf upgrade and on dev, this happened right at the end. The instance did not automatically restart.

post-transaction-actions: ls: cannot access '/etc/smart-restart-conf.d/*pre-restart': No such file or directory
ls: cannot access '/etc/smart-restart-conf.d/*post-restart': No such file or directory
Failed to read PID 3039547's smaps.
Failed to read PID 3039548's smaps.

[alinvetian]

I created 2 files that echo some messages on the config folder, one for *-pre-restart and on for *-post-restart
These files should not be required.