tests: Don't leak SimpleHTTPServers

tests/test-webserver.sh

@@ -5,8 +5,10 @@ set -euo pipefail
 dir=$1
 test_tmpdir=$(pwd)
 
-(cd ${dir} && env PYTHONUNBUFFERED=1 setsid python -m SimpleHTTPServer 0 >${test_tmpdir}/httpd-output) &
+cd ${dir}
+env PYTHONUNBUFFERED=1 setsid python -m SimpleHTTPServer 0 >${test_tmpdir}/httpd-output &
 child_pid=$!
+
 for x in $(seq 50); do
     sed -e 's,Serving HTTP on 0.0.0.0 port \([0-9]*\) \.\.\.,\1,' < ${test_tmpdir}/httpd-output > ${test_tmpdir}/httpd-port
     if ! cmp ${test_tmpdir}/httpd-output ${test_tmpdir}/httpd-port 1>/dev/null; then