tests: avoid hung processes due to gdb SIGCONT handling

* tests/tail-2/inotify-race.sh: Add a `wait` to ensure that
we reap all background gdb and tail processes.  That resulted
in the test hanging intermittently and upon investigation was
due to gdb intermittently failing to terminate the child process
due to receiving a SIGCONT signal.  Therefore we avoid using
timeout(1) which sends that signal, and instead rely on tail's
inbuilt --pid monitoring on a background sleep process.
Given this new implementation, the VERY_EXPENSIVE guard was removed.
Related issues with this test hanging were previously discussed at:
https://lists.gnu.org/archive/html/bug-coreutils/2009-12/msg00025.html

0 files changed, 0 insertions, 0 deletions