1. In the parent router process: wait for all of the immediate

1. In the parent router process: wait for all of the immediate
child processes to terminate before exiting.

This change eliminates the need for the shell script invoking
the router to sleep before running a ps to identify the effective
router processes (which are grandchildren of the parent). By the
time the parent exits, the children will have launched the
grandchildren and exited.

2. If any of the immediate child processes terminates abnormally
(either a non-zero return code or termination by a signal), issue
a warning message to that effect. This message goes to standard
error, since the parent process never opens a log file.

3. Apply the volatile qualifier to a couple of variables that
are updated asynchronously by a signal handler.

M    src/router/osrf_router.c
M    src/router/osrf_router_main.c

git-svn-id: svn://svn.open-ils.org/OpenSRF/trunk@1878 9efc2488-bf62-4759-914b-345cdb29e865