Changed the signal handling.

Changed the signal handling.

There are very few things you can safely do within a signal handler, and
shutting down an osrfRouter is not among them.

Now the signal handler just sets a switch for the main loop to look at.
The select call looks for errno == EINTR and then looks at the switch
that the signal handler sets.  If the switch is set, we exit the otherwise
infinite loop.  Then we free the osrfRouter and re-raise the signal.

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

git-svn-id: svn://svn.open-ils.org/OpenSRF/trunk@1836 9efc2488-bf62-4759-914b-345cdb29e865