Warn when a controller's destructor hangs (ros ticket #4509)

[ahendrix]

If a controller's destructor hangs for more than 10 seconds, the controller manager should split out a warning so the user knows what went wrong. (It might also be nice to be able to continue running instead of locking up completely).

trac data:

• Owner: wim
• Reporter: sglaser
• Reported at: Wed Jun 30 12:56:55 2010
• URL: https://code.ros.org/trac/wg-ros-pkg/ticket/4509