Improve tail command so we don't get output from other workflow child executions which directly tailing workflow child execution.
Improve tail command so we don't get output from other workflow child
executions which directly tailing workflow child execution.

nzlosh/st2,StackStorm/st2,Plexxi/st2,nzlosh/st2,StackStorm/st2,Plexxi/st2,Plexxi/st2,nzlosh/st2,StackStorm/st2,Plexxi/st2,nzlosh/st2,StackStorm/st2