Hide pt-summary and pt-mysql-summary actions for now

pt-mysql-summary should be run on the same Node where MySQL is running. From https://www.percona.com/doc/percona-toolkit/3.0/pt-mysql-summary.html:

The tool interacts minimally with the server upon which it runs. It assumes that you’ll run it on the same server you’re inspecting, and therefore it assumes that it will be able to find the my.cnf configuration file, for example. However, it should degrade gracefully if this is not the case. Note, however, that its output does not indicate which information comes from the MySQL database and which comes from the host operating system, so it is possible for confusing output to be generated if you run the tool on one server and connect to a MySQL database server running on another server.

Since is planned for 2.x, we should remove/hide public APIs for that action in 2.0.

Hide pt-summary as well.