Description of problem:
In some cases, long running task like LOCE task and Katello Event Monitor task in a heavy loaded Satellite can get kill forcefully when restarting the foreman-tasks.

After restarting the foreman-tasks, these tasks will get invalidated and enter paused/error state due to Abnormal termanation like below.
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6b764da1-7575-4b4b-a4ce-cb7b42bd8ae1,ForemanTasks::Task::DynflowTask,Actions::Candlepin::ListenOnCandlepinEvents,2019-06-23 07:53:31,,paused,error,97a1929c-1d6d-4ab2-a904-3338065334b0,,2019-06-23 07:53:31.69066

07:55:29.880357,118.021665403,87.6361777380003,0.5,1,Dynflow::ExecutionPlan::Steps::RunStep,"{""class"":""Dynflow::ExecutionPlan::Steps::Error"",""exception_class"":""StandardError"",""message"":""Abnormal termination (previous state: running)""
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Dynflow wait for 20 seconds and then kill the executors if the tasks still haven't finished by that time.
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Jun 24 14:33:09 my-satellite dynflowd: Dynflow Executor: stop in progress
Jun 24 14:33:09 my-satellite dynflowd: dynflow_executor: trying to stop process with pid 30687...
Jun 24 14:33:09 my-satellite dynflowd: dynflow_executor: trying to stop process with pid 30699...
Jun 24 14:33:29 my-satellite dynflowd: dynflow_executor: process with pid 30687 won't stop, we forcefully kill it...
Jun 24 14:33:29 my-satellite dynflowd: dynflow_executor: process with pid 30699 won't stop, we forcefully kill it...
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Since that we are setting the systemd TimeoutSec to 90 seconds, Dynflow should also increase the "force_kill_waittime" of ruby daemon to some value below 90 seconds.e.g 60 seconds.

cat /usr/lib/systemd/system/dynflowd.service
[Service]
Type=forking
User=foreman
TimeoutSec=90      <======================= Systemd timeout
WorkingDirectory=/usr/share/foreman
ExecStart=/usr/sbin/dynflowd start
ExecStop=/usr/sbin/dynflowd stop
EnvironmentFile=-/etc/sysconfig/dynflowd


daemons-1.2.3/lib/daemons/application.rb
    def initialize(group, add_options = {}, pid = nil)
      @group = group
      @options = group.options.dup
      @options.update(add_options)

      @dir_mode = @dir = @script = nil

      @force_kill_waittime = @options[:force_kill_waittime] || 20 <========== Default 20 seconds



Suggest to make the "force_kill_waittime" an option in Dynflow so that user can adjust it.