Add more detail to thread debug messages
Add more detail to thread debug messages

Track where the thread is in the loop, and which router it is
working on, to be reported by the 'workers debug' command.

Change-Id: I7549c03f67810bbeaa8a0647319897d4b9f7d8c2

dreamhost/akanda-rug,stackforge/akanda-rug,openstack/akanda-rug,openstack/akanda-rug,markmcclain/astara,stackforge/akanda-rug