Create a way to store customized commands

[camilosampedro]

Create a way to store some customized commands that can be sent to the computers.

I have two ideas for doing this:

• Use typesafehub/config (already available dependency) to have a conf file with commands. It is pretty clean but usually it is not intended for things that change during runtime, as it only reads and cache the config at startup.
• Use a SQL table for storing the commands.
• Use another file for storing them with another format.

Some considerations:

• Some commands could be different depending on which OS or distro is running on the computer. It could be a good idea to store different commands for a "command name" depending on the OS. The OS is already known.
• The commands should have information:
  • Executed with or without super user rights (sudo).
  • Don't wait for result flag: It is not very usual, but it is used when the command should not wait for a result (For example shutdown -h now) as maybe it will never come.
  • Executed by all the logged in users, by a specific user or by the provided ssh user. It is already know what are the logged in users.