When installing server plugins, it should be possible to do (SQL `install plugin`) without restarting a server on plugins that need no options.
A user shouldn't need to take downtime to install a plugin.
Likewise plugins should be able to be removed. Need to check if they are in use somehow, but otherwise it should be possible to remove without restart.
- s3 (if variables are global and not read only)
- gssapi (is that a server or client plugin??)