Extensions for control.sh

[Denis Mekhanikov]

Hi everyone!

Control.sh is a command-line management tool that you can use to manage 
your grid and check its vital parameters like topology version or 
availability of baseline nodes. It has is good set of commands which are 
suitable to work with vanilla Ignite.

There is also a way to extend functionality of Ignite by implementing a 
3rd-party plugin or a module. Any plugin or external module should have 
some kind of API to manage and monitor its activity.
If a command-line management command needs to be added, then the only 
way to achieve that is to provide an additional script, separate from 
control.sh. If you use multiple such plugins, then the set of required 
tools may grow and lead to confusion, which script should be used to 
configure which extension. Instead of doing that it would be convenient 
for users to have ability to use the same script, but with an extended 
set of options. It should make lifes of 3rd-party vendors easier.

Currently many integrations and community-supported modules are being 
moved outside of the core product: 
https://cwiki.apache.org/confluence/display/IGNITE/IEP-36%3A+Modularization
I think it makes sense to provide a possibility to configure extensions 
using control.sh, since their number will grow over time, and some of 
them will require some runtime configuration.

What do you think?

Denis