tests: Make OVS_APP_EXIT_AND_WAIT() wait for process termination
Currently OVS_APP_EXIT_AND_WAIT() only waits for the pid file
to be removed. When using gcov (and likely other utilities),
we need to ensure that the application has actually exited.
Also adding AT_CHECK() around the exit request to allow simplification
of tests using open-coded versions of this macro.
Signed-off-by: Lance Richardson <lrichard@redhat.com> Signed-off-by: Ben Pfaff <blp@ovn.org>