log:tail threads keep running after ssh exits

When executing log:tail via Karaf's ssh connection, the created thread is not killed when the ssh connection is killed or timeouts.

I believe that all threads launched via ssh should be killed if the session is no longer active.

Steps to reproduce:

• Open a ssh connection with Karaf
• Run log:tail
• Either close the session without exiting log:tail or wait until it timeouts in a few minutes;
• Run shell:threads | grep log:tail on the console or another ssh connection
• A log tail thread should still be running.

Every time this process is repeated, a new log:tail thread will appear and stay alive.

I've attached the return of one of my shell:thread commands.