vcl: 204 response fetched from ts-processor and cached
mock-processor: generate the 204 response, name changed to ts-processor

           Mutexing increment of tbl.open after ReqStart
vcl: do not log the URL /ts-rcv

Updated monitoring stats for MQ sends or fails, mutexing stats updates

to which the second arg of pthread_join points be allocated from outside
the thread, not from within the thread.

Also added the signal handler to dump the table's contents on USR1.

(generated by configure.ac)

(as in Varnish)

(from varnishlog -w), and a 'make check' target to run a
regression test.