Improve the API for the obj-iter code a bit.
Style nits
Compact the status parsing code, it got a little too verbose for
Federico's taste :-)
Protect the obj->storage list with bo->mtx during the fetching.
Pass the rx timestamp into RFC2616_Ttl() to collect all the
time-math one place.
Fix a race (detected with Fryer and diagnosed by Martin) when we
clear req->wrk on a busy-waiting request.
Collaps ->age and ->entered into ->t_origin.  This is the time this
object was created, as best we can determine it from the headers etc.

This is also the point from which ttls should be counted.
Set the client/backend bit when synthesizing log records
Implement the vxid_parent field of reported VSL transactions
Fix Ctrl-C handling in VUT_main

Left over code in VUT_main was preventing Ctrl-C handling when looping
trying to reconnect. Remove offending code.
Make transaction limit and timeout into cmd line options
Flush file output on exit

Make sure to flush the file stream on exit in VUT
Adjust test-cases for slightly slimmer exp structure