Add KillApplication plugin to VisualVM distribution

[MartinBalin]

Is your feature request related to a problem? Please describe.
I always install KillApplication plugin to VisualVM when I install it. It is useful when troubleshooting Java processes to kill these which misbehave.

Describe the solution you'd like
Make KillApplication plugin part of VisualVM distro

[zouzanyan]

i also need, it is convenient

[thurka]

Done in master.