Fix test_user_switched_to_root by only checking uid and gid are 0, the

groups part of id command varies from Linux distribution.

--
Change-Id: Ia8dbc0a645afe1a4b1558877e56d8b44fde7c386
Reviewed-on: https://bazel-review.googlesource.com/#/c/2111/
MOS_MIGRATED_REVID=105068270

src/test/shell/bazel/namespace-runner_test.sh

@@ -100,7 +100,7 @@ function test_default_user_is_nobody() {
 
 function test_user_switched_to_root() {
   $WRAPPER $WRAPPER_DEFAULT_OPTS -r -l $OUT -L $ERR -- /usr/bin/id || fail
-  assert_output "uid=0 gid=0 groups=65534,0" ""
+  assert_contains "uid=0 gid=0" "$OUT"
 }
 
 function test_network_namespace() {