tests/int/checkpoint: rm useless code

Commit 417f5ff40 added a code to close fds and kill processes, which
should have helped in an event of test case failure.

In fact, each test case is executed in a subshell, so
 - any variables set there can't reach teardown();
 - all the fds are closed (as the process is gone).

Now, I am not sure about the processes, but the code being removed
has never worked anyway, so it does not make sense to keep it.
Normally, those are waited for. In case of a test case failure,
well, the subsequent cases might fail, too.

Fixes: 417f5ff40d
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

tests/integration/checkpoint.bats

@@ -12,17 +12,6 @@ function setup() {
 
 function teardown() {
   teardown_busybox
-  local pid fd
-
-  for pid in "${PIDS_TO_KILL[@]}"; do
-    kill -9 "$pid" || true
-  done
-  PIDS_TO_KILL=()
-
-  for fd in "${FDS_TO_CLOSE[@]}"; do
-    exec {fd}>&-
-  done
-  FDS_TO_CLOSE=()
 }
 
 function setup_pipes() {
@@ -42,8 +31,6 @@ function setup_pipes() {
 	exec {in_r}</proc/self/fd/$pipe
 	exec {in_w}>/proc/self/fd/$pipe
 	exec {pipe}>&-
-	# shellcheck disable=SC2206
-	FDS_TO_CLOSE=($in_r $in_w $out_r $out_w)
 }
 
 function check_pipes() {
@@ -163,13 +150,9 @@ function simple_cr() {
   # shellcheck disable=SC2094
   exec {lazy_r}</proc/self/fd/$pipe {lazy_w}>/proc/self/fd/$pipe
   exec {pipe}>&-
-  # shellcheck disable=SC2206
-  FDS_TO_CLOSE+=($lazy_r $lazy_w)
 
   __runc --criu "$CRIU" checkpoint --lazy-pages --page-server 0.0.0.0:${port} --status-fd ${lazy_w} --work-path ./work-dir --image-path ./image-dir test_busybox &
   cpt_pid=$!
-  # shellcheck disable=SC2206
-  PIDS_TO_KILL=($cpt_pid)
 
   # wait for lazy page server to be ready
   out=$(timeout 2 dd if=/proc/self/fd/${lazy_r} bs=1 count=1 2>/dev/null | od)
@@ -187,8 +170,6 @@ function simple_cr() {
   # Start CRIU in lazy-daemon mode
   ${CRIU} lazy-pages --page-server --address 127.0.0.1 --port ${port} -D image-dir &
   lp_pid=$!
-  # shellcheck disable=SC2206
-  PIDS_TO_KILL+=($lp_pid)
 
   # Restore lazily from checkpoint.
   # The restored container needs a different name as the checkpointed
@@ -211,7 +192,6 @@ function simple_cr() {
   wait $cpt_pid
 
   wait $lp_pid
-  PIDS_TO_KILL=()
 
   check_pipes
 }